Why is "throws Exception" necessary when calling a function?

Why is "throws Exception" necessary when calling a function?

java exception-handling unhandled-exception throws checked-exceptions

java

How to use Java-style throws keyword in C#?

c# java exception-handling throws

java

Is there a throws keyword in C# like in Java? [duplicate]

c# java exception throw throws

java

When to use throws in a Java method declaration?

java exception-handling throws

java

Is there a way to make Runnable's run() throw an exception?

java android runnable throws

java

Throws or try-catch

java exception exception-handling try-catch throws

java

Exception handling : throw, throws and Throwable

java exception-handling throw throws throwable

java

Difference between Throws in method signature and Throw Statements in Java

java throw throws

java