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In this tutorial, you'll learn how to validate fields in a Pydantic model. First, Pydantic is imported from the package. A user model is created, inheriting from the base model, with fields such as name (string), age (integer), and email (string). The validation requirements are established: age must be a positive integer, and the email must include the '@' symbol. To perform the validation, Pydantic's validator is used. You specify the field you want to validate (e.g., age) and define a function that implements the validation logic, such as ensuring the age is positive.