In VB.NET, how do Sub and Function differ?

A Sub performs an operation without returning a value through its declaration, while a Function returns a value of a declared or inferred return type. Both can accept parameters and can have observable effects. Choose a Function when the caller needs a result, such as a calculated total, and keep the type explicit in public APIs. A Sub can still modify shared state or an argument through ByRef, so returning nothing does not mean doing nothing. These questions use VB.NET rather than legacy VB6 unless stated otherwise.