Built-in Mathematica Symbol

Begin

Begin["context`"]
resets the current context.

The interpretation of symbol names depends on context. Begin thus affects the parsing of input expressions.

Define a function f in the MyContext` Context:

Restore the context:

f will generally be hidden in the restored context:

The definitions are all in MyContext`f :

The function can be called using its fully qualified name:

Define a function f in the MyContext` Context:

Restore the context:

f will generally be hidden in the restored context:

The definitions are all in MyContext`f :

The function can be called using its fully qualified name:

Make symbols used for package function definitions private, reducing the possibility for conflict:

Any use of the symbol f in the package context ensures that f is created in that context:

When the context given to Begin starts with ` it extends from the current context:

Since the symbol f is in the package context, the function works after EndPackage:

You can see that the other variable uses the private context: