The `ForeignKey` class in `flask.ext.sqlalchemy.SQLAlchemy` module is a representation of a foreign key constraint in a database table. It is used in conjunction with SQLAlchemy in a Python Flask application to define relationships between tables in a relational database system. By creating foreign key relationships, developers can enforce referential integrity and enable the retrieval of related data across multiple tables. The `ForeignKey` class is a useful tool for building robust and efficient database models in Flask applications.
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