Entity Framework is a object-relational mapping (ORM) framework.
The advantages of using an ORM in the application is that it takes the security aspect away from the programmer. This means that the integration between application and database is likely to be more secure.
Available in .NET Framework and .NET Core, it integrates a .NET application with a database, with Microsoft SQL Server very well supported.
It has support for LINQ queries, change tracking, updates and schema migrations.
Previous versions of Entity Framework had support for "database-first". This is where you created the database, hook your application to that database and import the database structure into your .NET application.
However, latest versions of Entity Framework support "code-first". You build up your entities in your application and add them to a DbContext. Then, you can use EF Migrations to import the entities and properties to your database. The entities are translated into tables, and the properties are translated into columns.