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# Pydantic Validation (Latest) > Data validation using Python type hints Pydantic is the most widely used data validation library for Python. Fast and extensible, Pydantic plays nicely with your linters/IDE/brain. Define how data should be in pure, canonical Python 3.9+; validate it with Pydantic. ## Get Started - [Changelog](https://pydantic.dev/docs/validation/latest/get-started/changelog/index.md) - [Contributing](https://pydantic.dev/docs/validation/latest/get-started/contributing/index.md) - [Help with Pydantic](https://pydantic.dev/docs/validation/latest/get-started/help_with_pydantic/index.md) - [Installation](https://pydantic.dev/docs/validation/latest/get-started/install/index.md) - [Migration Guide](https://pydantic.dev/docs/validation/latest/get-started/migration/index.md): Migrating from Pydantic V1. - [Version Policy](https://pydantic.dev/docs/validation/latest/get-started/version-policy/index.md) - [Why use Pydantic](https://pydantic.dev/docs/validation/latest/get-started/why/index.md) ## Concepts - [Alias](https://pydantic.dev/docs/validation/latest/concepts/alias/index.md) - [Configuration](https://pydantic.dev/docs/validation/latest/concepts/config/index.md) - [Conversion Table](https://pydantic.dev/docs/validation/latest/concepts/conversion_table/index.md) - [Dataclasses](https://pydantic.dev/docs/validation/latest/concepts/dataclasses/index.md) - [Experimental](https://pydantic.dev/docs/validation/latest/concepts/experimental/index.md) - [Fields](https://pydantic.dev/docs/validation/latest/concepts/fields/index.md) - [Forward Annotations](https://pydantic.dev/docs/validation/latest/concepts/forward_annotations/index.md) - [JSON](https://pydantic.dev/docs/validation/latest/concepts/json/index.md) - [JSON Schema](https://pydantic.dev/docs/validation/latest/concepts/json_schema/index.md) - [Models](https://pydantic.dev/docs/validation/latest/concepts/models/index.md) - [Performance](https://pydantic.dev/docs/validation/latest/concepts/performan