Database migrations in ASP.NET Core allow you to manage changes to your application's database schema over time. You can use the Entity Framework Core (EF Core) migrations feature to create and apply database migrations. Migrations allow you to define the changes to the database schema in code and apply them to the database. EF Core automatically generates SQL scripts to apply the migrations. By executing migration commands, you can create a new database, update an existing database, or roll back migrations if needed.