What is the purpose of using statement in C#?

Provides a convenient syntax that ensures the correct use of IDisposable objects. https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/using-statement

using helps to automatically dispose data once you are out of loop and is preferred rather than explicitly opening and closing connections of object. SYNTAX using () { }

using keyword is used to include a namespace in the program. A program generally has multiple using statements.