SQLAlchemy is a popular Python library used to interact with SQL databases. It provides tools for sending raw queries, constructing SQL statements, and mapping Python classes to database tables using the object-relational mapper (ORM). The library has flexibility in its approach to working with databases, allowing it to support various approaches and be used in different types of projects. To use SQLAlchemy, you need to set up an engine object, which manages connections to your database. This is typically done by installing a database driver, creating a connection string, and then using the create_engine function to create the engine object. Once the engine object is created, you can start sending raw SQL statements or using the ORM to interact with your database. The ORM allows you to define classes that map to your tables, making it easier to work with your data in Python. With this library, you can perform various operations such as creating and inserting data into tables, querying data, and managing relationships between tables.