What is the meaning of /** in PHP?

For example:

/**
     * Method to display a view.
     *
     * @param   boolean         If true, the view output will be cached
     * @param   array           An array of safe url parameters and their variable types, for valid values see {@link JFilterInput::clean()}.
     *
     * @return  JController     This object to support chaining.
     * @since   1.5
     */

i cant seem to search about it? what is the keyword to use for me to be able to search on it? does it go into the code or just a comment?