# FiftyOne terminology
Available in:
Open SourceEnterprise
This cheat sheet introduces the key terminology in the world of FiftyOne.
## The basics
| FiftyOne | The open-source framework, the core library,
and the Python SDK. |
|---------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| FiftyOne App | The [provided user interface](../user_guide/app.md#fiftyone-app) for graphically
viewing, filtering, and understanding your datasets. Can be launched in
the browser or within notebooks. |
| FiftyOne Enterprise | [The enterprise-grade suite](https://voxel51.com/enterprise/)
built on top of FiftyOne for collaboration, permissioning, and working
with cloud-backed media. |
## Other components
| Brain | Library of [ML-powered capabilities](../brain/index.md#fiftyone-brain) for
computation and visualization. |
|-------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Dataset Zoo | [Collection of common datasets](../dataset_zoo/index.md#dataset-zoo) available for
download and loading into FiftyOne. |
| Model Zoo | [Collection of pre-trained models](../model_zoo/index.md#model-zoo) available for
download and inference. |
| Plugin | A module you can use to [customize and extend](../plugins/overview.md#fiftyone-plugins)
the behavior of FiftyOne. |
| Operator | A [plugin subcomponent](../plugins/using_plugins.md#using-operators) that defines an
operation that can be executed either directly by users in the App
and/or internally invoked by other plugin components |
| Integration | A dataset, ML framework, annotation service, or other tool FiftyOne is
[directly compatible with](../integrations/index.md#integrations). |
## Data model
| Dataset | [Core data structure](../user_guide/basics.md#basics-datasets) in FiftyOne, composed of
`Sample` instances. Provides a consistent interface for loading
images, videos, metadata, annotations, and predictions. The computer
vision analog of a table of data. |
|-------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Sample | The atomic elements of a `Dataset` that store all the information
related to a given piece of data. Every [sample](../user_guide/basics.md#basics-samples)
has an associated media file. The computer vision analog of a row of
tabular data. |
| DatasetView | [A view into](../user_guide/using_views.md#using-views) a `Dataset`, which can filter,
sort, transform, etc. the dataset along various axes to obtain a
desired subset of the samples. |
| ViewStage | [A logical operation](../user_guide/using_views.md#view-stages), such as filtering, matching,
or sorting, which can be used to generate a `DatasetView`. |
| Field | Attributes of `Sample` instances that
[store customizable information](../user_guide/basics.md#basics-fields) about the
samples. The computer vision analog of a column in a table. |
| Embedded Document Field | [A collection of related fields](../user_guide/using_datasets.md#custom-embedded-documents)
organized under a single top-level `Field`, similar to a nested
dictionary. |
| Label | Class hierarchy used to
[store semantic information](../user_guide/basics.md#basics-labels) about ground truth
or predicted labels in a sample. Builtin `Label` types include
`Classification`, `Detections`, `Keypoints`, and many others. |
| Tag | A field containing a list of strings representing relevant
information. [Tags](../user_guide/basics.md#basics-tags) can be assigned to datasets,
samples, or labels. |
| Metadata | A special `Sample` field that can be automatically populated with
media type-specific [metadata](../user_guide/basics.md#basics-metadata) about the raw
media associated with the sample. |
| Aggregation | A class encapsulating the computation of an
[aggregate statistic](../user_guide/basics.md#basics-aggregations) about the contents of
a dataset or view. |
## FiftyOne App
| Session | [An instance of the FiftyOne App](../user_guide/app.md#app-sessions) connected to a
specific dataset, via which you can use to programmatically interact
with the App. |
|--------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Sample grid | The rectangular [media grid](../user_guide/app.md#app-filtering) that you can scroll
through to quickly browse the samples in a dataset. Click on any media
in the grid to open the sample modal. |
| Sample modal | The [expanded modal](../user_guide/app.md#app-sample-view) that provides detailed
information and visualization about an individual sample in a dataset. |
| Sidebar | Vertical component on [left side of App](../user_guide/app.md#app-fields-sidebar)
that provides convenient options for filtering the dataset and
toggling the visibility of fields in the sample grid. |
| View bar | [Horizontal bar at the top of the App](../user_guide/app.md#app-create-view) where
you can create and compose view stages via point and click operations
to filter your dataset and show only the content of interest. |