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+# Data Loaders
+
+Hamilton comes with tooling that allows you to easily load data from external sources.
+While you *can* load data from within your functions (after all, Hamilton places no
+restrictions on what you do with your functions), using Hamilton's data loading
+infrastructure provides a myriad of benefits:
+
+1. Less repeated code
+    The logic for all data loading is centralized by the framework, and can be reused.
+2. Cleaner looking code
+    The code to load data will not be combined with the code to process it.
+3. Configuration-driven data loading
+    Hamilton's data loaders consume configuration parameters that allow for sensible defaults. This gives you fine-grained control over the way your data loads and allows for setting paramters once, globally.
+4. Shared connection pools
+    Hamilton's data loaders have the capability of registering/sharing db connections, enabling you to write multiple loaders without handling connection-related issues yourself.
+5. Highly customizable compponents
+    Hamilton's data loaders assume commonalities, but
+
+## Initial Examples
+
+Alright, let's jump into a few examples that highlight the points above:
+
+### Loading from a CSV
+
+With the following example, we load a pandas dataframe from a local path. Note some things:
+
+1. The CSVLoader is instantiated with no params -- all of these will be configurable.
+2. We pass path/include_columns to the CSVLoader, this will get injected into its 'load' section.
+3. There are no other configuration elements needed, so this is all we need to run this.
+```python
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import CSVLoader, load_from
+from hamilton.function_modifiers.dependencies import config
+from hamilton.function_modifiers import extract_columns
+@extract_columns("col1", "col2")
+@load_from(
+    CSVLoader(),
+    path=config("my_data.csv_path"),
+    include_columns=["col1", "col2"],
+    separator=","
+)
+def loaded_data(df: pd.DataFrame)  -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+```
+
+### Loading raw data from S3
+
+```python
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import S3RawData, load_from
+from hamilton.function_modifiers.dependencies import config
+from io import BytesIO
+from hamilton.function_modifiers import extract_columns
+@extract_columns("col1", "col2")
+@load_from(
+    S3RawData(format="csv"),
+    # S3LoaderToDataFrame(format="pickle")
+    bucket=config("loaded_data.s3.bucket"),
+    key=config("loaded_data.s3.key"),
+)
+def loaded_data(bytes_io: BytesIO)  -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+```
+
+### Loading a dataframe from S3
+
+#### Configuring bucket/key
+```python
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import S3LoaderToDataFrame, load_from
+from hamilton.function_modifiers.dependencies import config
+from hamilton.function_modifiers import extract_columns
+@extract_columns("col1", "col2")
+@load_from(
+    S3LoaderToDataFrame(format="csv"),
+    # S3LoaderToDataFrame(format="pickle")
+    bucket=config("loaded_data.s3.bucket"),
+    key=config("loaded_data.s3.key"),
+)
+def loaded_data(df: pd.DataFrame)  -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+```
+
+### Running a SQL query against a postgres database
+
+You can run a simple SQL query if you want. Note that this requires a configuration parameter set called `postgres` with the follwoing keys:
+
+1. `host`
+2. `port`
+3. `user`
+4. `password`
+5. `database`
+
+```python
+
+Note that this does not make use of multiple connections, and instead uses a default connection.
+```python
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import S3LoaderToDataFrame, load_from
+from hamilton.function_modifiers.dependencies import config
+from hamilton.function_modifiers import extract_columns
+@extract_columns("col1", "col2")
+@load_from(
+    PostgresSQL(),
+    query="SELECT col_1 as col1, col_2 as col2 FROM my_table WHERE condition_column = 1",
+)
+def loaded_data(df: pd.DataFrame)  -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+
+# This uses a shared connection. Defaults to the standard connection
+# Use this if you want to
+dr = driver.Driver({
+    'postgres.default_connection' : {
+        'host': 'YOUR_HOST',
+        'port': 5432,  # probably
+        'user': 'YOUR_USERNAME',
+        'password': os.environ['POSTGRES_PASSWORD'], # Or some other secure way of loading it
+        'database' : 'YOUR_DATABASE'
+    }
+}, data_loaders)
+dr.execute(['col3, 'col4'])
+```
+
+In this case you'd add a dict called `postgres.secondary_connection` with the following to the config:
+
+1. `host`
+2. `port`
+3. `user`
+4. `password`
+5. `database`
+
+```python
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import S3LoaderToDataFrame, load_from
+from hamilton.function_modifiers.dependencies import config
+from hamilton.function_modifiers import extract_columns
+
+# Option 1:
+@extract_columns("col3", "col4")
+@load_from(
+    PostgresSQL(),
+    query="SELECT col_3 as col3, col_4 as col4 FROM my_table WHERE condition_column = 1",
+    connection="secondary_connection" # This
+)
+def loaded_data_2(df: pd.DataFrame)  -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+
+# Option 2:
+
+@load_from.sql(
+    query="SELECT col_3 as col3, col_4 as col4 FROM my_table WHERE condition_column = 1",
+    connection="secondary_connection" # This
+)
+
+
+# This uses a namespaced connection
+dr = driver.Driver({
+    'postgres.secondary_connection' : {
+        'host': 'YOUR_HOST',
+        'port': 5432,  # probably
+        'user': 'YOUR_USERNAME',
+        'password': os.environ['POSTGRES_PASSWORD'], # Or some other secure way of loading it
+        'database' : 'YOUR_DATABASE'
+    }
+}, data_loaders)
+dr.execute(['col3', 'col4'])
+```
+If you prefer not to handle configurations like this, you can just pass it in directly.
+This is nice for ad-hoc work, but the connection won't be shared/cached.
+
+Furthermore, you have less control over the source of the inputs.
+
+```python
+import os
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import S3LoaderToDataFrame, load_from
+from hamilton.function_modifiers.dependencies import config
+from hamilton.function_modifiers import extract_columns
+
+@load_from.sql(
+    connection="default_connection"
+)
+def loaded_data_2(condition_number: int) -> Table:
+    return "SELECT col_3 as col3, col_4 as col4 FROM my_table WHERE condition_column = {{condition_number}}"
+
+@extract_columns("col3", "col4")
+@load_from(
+    PostgresSQL(),
+    query=value("query"),
+    connection={
+        'host': 'YOUR_HOST',
+        'port': 5432,  # probably
+        'user': 'YOUR_USERNAME',
+        'password': os.environ['POSTGRES_PASSWORD'] # Or some other secure way of loading it
+        'database' : 'YOUR_DATABASE'
+    }
+)
+def loaded_data_2(df: pd.DataFrame) -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+
+# No config needed here:
+dr = driver.Driver({}, data_loaders)
+dr.execute({}['col3', 'col4'])
+```
+
+If you forget any of the configurations above, we will complain loudly within the loader so you know which ones to add.
+
+
+### Running a parameterized query against a postgres database
+
+You can also utilize jinja templates -- this effectively makes the SQL query now accept inputs/configs. E.G. other nodes, configs, inputs, etc...
+
+Just remember to pass them into the driver!
+
+In this case we're passing them in as inputs. Note that the SQL statements can be as arbitrary complex as you want,
+and they can even refer to upstream functions for their parameters, in case you want to get really fancy.
+
+```python
+import os
+import pandas as pd
+from hamilton.function_modifiers.data_loaders import S3LoaderToDataFrame, load_from
+from hamilton.function_modifiers.dependencies import config
+from hamilton.function_modifiers import extract_columns
+
+
+@extract_columns("col3", "col4")
+@load_from(
+    PostgresSQL(),
+    query="SELECT col_3 as col3, col_4 as col4 FROM my_table WHERE condition_column = {{filter_condition}}",
+)
+def loaded_data_2(df: pd.DataFrame) -> pd.DataFrame:
+    """Data is loaded above, passed in, and you have the change to modify it!"""
+    return df
+
+dr = driver.Driver({
+    "postgres.default_connection" : {...}
+}, data_loaders)
+dr.execute(['col3', 'col4'], {'filter_condition' : 1})
+```
+
+
+### Loading a dataframe from a parquet file
+
+### Loading from the OpenAI API
+
+### Loading from BigQuery with an SQL query
+
+###
+
+## SQL
+
+## Extending
+
+## How this works
diff --git a/hamilton/adapters/__init__.py b/hamilton/adapters/__init__.py
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