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+***********
+Application
+***********
+========
+Overview
+========
+The ``Application`` class facilitates the execution of computational tasks within an ``Experiment`` workflow.
+These tasks include launching compiled applications, running scripts, or performing general
+computational operations. ``Application(s)`` integrate into ``Job(s)``, where ``LaunchSettings`` provide
+launcher-specific behavior for the ``Job``.
+
+==========
+Initialize
+==========
+A ``Application`` requires two input arguments: name and executable. Optionally, users may
+provide executable arguments. This section details argument names, argument types
+and how to use the arguments to initialize an ``Application``.
+
+**Step 1: Import Application**
+
+After installing Smartsim, ``Application`` may be imported in Python code like:
+
+.. code-block:: python
+
+    from smartsim import Application
+
+**Step 2: Set the Application Name, Executable and Executable Arguments**
+
+The `name` is a string that identifies the application, and `exe` is the string path to the executable.
+Optionally, you can provide `exe_args` as a string or sequence of strings.
+
+* `name`: A string that identifies the application. Example:
+
+  .. code-block:: python
+
+    name="my_app"
+
+* `exe`: A string that specifies the path to the executable. If only the executable name is provided, SmartSim
+  will attempt to locate the path on the system. Examples:
+
+  .. code-block:: python
+
+    exe = "/path/to/new_executable"
+
+    exe = "new_executable"
+
+* `exe_args`: An optional argument of type string or sequence of strings, representing the arguments
+  for the executable. Examples:
+
+  .. code-block:: python
+
+    exe_args="--arg1 value1 --arg2 value2"
+
+    exe_args=["--arg1", "value1", "--arg2", "value2"]
+
+**Example initialize an Application:**
+
+.. code-block:: python
+
+    from smartsim import Application
+
+    app = Application(
+        name="my_app",
+        exe="/path/to/executable",
+        exe_args="--arg1 value1 --arg2 value2"
+    )
+
+======
+Modify
+======
+This section explains how to modify the attached executable and executable arguments. Additionally,
+learn how to attach copy, symlink and configuration files to an initialized ``Application``.
+
+Executable
+==========
+To overwrite the executable, assign the desired executable path to the ``exe`` attribute.
+If only the executable name is specified, SmartSim will attempt to locate the executable path on the
+machine. For example:
+
+.. code-block:: python
+
+    my_app.exe = "/path/to/new_executable"
+
+    my_app.exe = "new_executable"
+
+Executable Arguments
+====================
+There are two methods to configure ``exe_args``:
+
+1. Use ``Application.exe_args`` to overwrite the existing executable arguments.
+2. Use ``Application.add_exe_args`` to add to the existing executable arguments.
+
+**Option 1: Use Application.exe_args**
+
+Set the executable arguments directly by assigning a list of arguments or a string argument
+to the ``exe_args`` attribute. This will overwrite any previously set executable arguments.
+For example:
+
+  .. code-block:: python
+
+      my_app.exe_args = ["arg1", "arg2"]
+
+      my_app.exe_args = "arg1"
+
+**Option 2: Use Application.add_exe_args**
+
+To add additional executable arguments after initializing the ``Application`` object, use the
+``add_exe_args`` method. This method appends the new arguments to the existing ``exe_args`` without
+overwriting them. For example:
+
+  .. code-block:: python
+
+      my_app.add_exe_args(["new_arg1", "new_arg2"])
+
+      my_app.add_exe_args("new_arg1")
+
+Input Files
+===========
+This section details how to attach files to an ``Application``. SmartSim supports three file operations:
+
+1. :ref:`Copy<app_file_copy>`
+2. :ref:`Symlink<app_file_symlink>`
+3. :ref:`Configure<app_file_configure>`
+
+The ``Application.files`` attribute enables adding the file operations. Continue to the operation
+sections for further explanation.
+
+.. _app_file_copy:
+
+----
+Copy
+----
+The copy operation involves creating a duplicate of the source file or folder at the destination
+path within the job's run directory.
+
+**Add a Copy Operation:**
+To add a copy operation, use the ``add_copy`` method on ``Application.files``. This method requires
+an absolute source path (``src``) and an optional relative destination path (``dest``) of
+type ``pathlib.Path``. For example:
+
+.. code-block:: python
+
+    my_app.files.add_copy(
+        src=pathlib.Path("/path/to/source"),
+        dest=pathlib.Path("destination")
+    )
+
+This will create a copy of the file located at `"/path/to/source"` and place it within the job's
+run directory at `"/job/run/destination"`.
+
+.. _app_file_symlink:
+
+-------
+Symlink
+-------
+The symlink operation involves creating a symbolic link from the source file to the destination path
+within the job's run directory.
+
+**Add a Symlink Operation:**
+To add a symlink operation, use the ``add_symlink`` method on ``Application.files``. This method requires
+the absolute source path (``src``) and an optional relative destination path (``dest``) of type
+``pathlib.Path``. For example:
+
+.. code-block:: python
+
+    my_app.files.add_symlink(
+        src=pathlib.Path("/path/to/source"),
+        dest=pathlib.Path("destination")
+    )
+
+This will create a symbolic link from the file located at `"/path/to/source"` to the job's
+run directory at `"/job/run/destination"`.
+
+.. _app_file_configure:
+
+---------
+Configure
+---------
+The configure operation involves modifying the content of the source file based on specified parameters and
+then placing the modified file at the destination path.
+
+**Add a Configure Operation:**
+To add a configure operation, use the ``add_configuration`` method on ``Application.files``.
+This method requires the absolute source path (``src``), an optional relative destination path (``dest``), and file parameters
+(``file_parameters``) of type mapping of string to strings. Additionally, specify an optional tag
+(``tag``) to identify the configuration. For example:
+
+.. code-block:: python
+
+    my_app.files.add_configuration(
+        src=pathlib.Path("/path/to/source"),
+        file_parameters={"key": "value"},
+        dest=pathlib.Path("destination"),
+        tag=";"
+    )
+
+This will modify the content of the file located at `"/path/to/source"` based on the specified parameters and
+place the modified file at `"/job/run/destination"`.
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