Answer / Prveen

An abstract class in C# is a type of class that cannot be instantiated directly and serves as a base class for other classes. Abstract classes contain at least one or more abstract methods, which are method signatures without any implementation. To declare an abstract class, use the keyword 'abstract' before its name:

```csharp
abstract class MyAbstractClass
{
public abstract void MyAbstractMethod(); // Abstract method signature
}
```

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