> ## Documentation Index
> Fetch the complete documentation index at: https://docs.encord.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Modality Specific Annotation
## Intro
Adding labels, using the Label Editor, to data units follows the same basic process for all types of data units (a file or group of files).
1. Select a task from the *Queue*.
The Label Editor opens with the data unit (a file or group of files) in the workspace.
2. Read the **Annotation instructions** for the task, if there are any.
3. Select a label type, from the *Classes* list, using the cursor or keyboard shortcuts.
4. Label the data unit in the Label Editor workspace.
5. Submit the task for review.
Each modality (type of data) have classes (object or classification) that you can use to label the data units in a Project. Depending on the modality, how you label a data unit can change. For example, you can label images and videos with things like bounding boxes, polygons, or bitmasks and classifications. For audio files, you can use audio regions and classifications.
## Best Practices
The fastest way to label data units is by using automatic labeling features (like SAM 3 or Agents). Learn more about automatic labeling [here](/persona-taskers/tasker-annotate-auto).
## Label Editor Settings
Use Label Editor Settings to optimize your labeling experience for each Project or task. For example, using **Turbo mode** allows you to navigate through one class instance at a time Turbo mode hides all other object labels except the label being viewed. This is useful if a class has a large number of attributes, or if there is a large number of object instances.
## Images
When labeling objects on images, we recommend using keyboard shortcuts as much as possible. It speeds up your ability add labels to a data unit.
Right click on labels to display options for the label. For example, from the menu you can copy labels. You can also discover the shortcuts for the actions you can perform on the labels.
## Videos and Image Sequences
Use the Timeline to view the object labels and classifications across the data unit. You can also use the Timeline to add classifications directly to a range of frames in a data unit.
## Audio
Use the Timeline to view and create classifications across the data unit.
## Documents
Use the shortcut CONTROL + SHIFT + O to turn the *Show text outlines* feature on and off.
## Text and HTML
The **Show text annotations** pane is not available for HTML files.
## Point Cloud Data
You annotate from the PCD workspace or from the 2D view of the Scene.
Use **Interpolate** to automatically track objects through Scenes.
For a full list of all settings and options, go [here](/platform-documentation/Annotate/annotate-label-editor/annotate-pcd#editor-actions)
## Medical Images
For a full list of information on annotating medical images go here:
* [DICOM basics](/platform-documentation/Annotate/annotate-label-editor/annotate-dicom)
* [Mammography](/platform-documentation/Annotate/annotate-label-editor/annotate-mammo)
## Multi-Modal
Adding labels or classifications to multi-modal tasks (tasks with different types of data units) simply follows the process outlined in the other sections of this article.