Update someone on something / Inform someone of / about something / Notify someone of something
UsageUpdate someone on the latest position; inform someone of or about facts; notify someone of something when communicating formally or officially.
Update someone on something
Use when
You give someone the latest developments or current status.
Example
“Please update the Director on the implementation status.”
Inform someone of / about something
Use when
You give someone facts or information.
Example
“Please inform all applicants of the revised closing date.”
Notify someone of something
Use when
You communicate information formally or officially.
Example
“The agency will notify successful applicants of the outcome in writing.”
Quick check
update me the status, inform to the Director, notify the outcome to applicants
Usage note
Update can take a document or system directly when you mean revise it, as in update the register. Notify and inform can also take that-clauses.