What do curly braces {} define in a Java class?

Curly braces in a Java class are used to define class blocks that group related data and methods together. When you create a class in Java, the class definition is enclosed within these curly braces, indicating the beginning and end of the class body. Inside this block, you can declare member variables (fields) and define methods that operate on those variables, encapsulating the data and behavior related to that class.

This organization enhances readability and structure, allowing developers to see at a glance which methods and variables belong to a particular class. It also plays a crucial role in the access control of class members, as visibility modifiers can be applied within this block.