# "What is" command in Mathematica [duplicate]

I'm looking for "What is" command in Mathematica. For example, the command WhatIs[function[x]] gives a definition of the function given anywhere in the notebook or generally in kernel.

Could anyone please tell me whether this command exist?

• Take a look at Information and friends. And maybe GeneralUtilitiesPrintDefinitions
– Kuba
Jul 23 '18 at 17:38
• If your question is meant also in the OOP context, Head might be also something to look for. Jul 23 '18 at 17:40
• See also ? and ?? Jul 23 '18 at 17:42
• Just use ? and ??` Jul 23 '18 at 19:25