newcommand latex

\newcommand{\mycommand}{Hello, world!}

Explanation: - \newcommand: This command is used to create a new command in LaTeX. - {\mycommand}: This is the name of the new command we are defining. It can be used to call the command later in the document. - {Hello, world!}: This is the content of the new command. When the command \mycommand is used in the document, it will be replaced with "Hello, world!"