Question

what is the function of fuse​

Answer 1

The function of a fuse is usually to prevent fire - that's the basic protection a fuse offers - between power supply and appliance there may be a few feet or metres of cable - if a short circuit occurs in the appliance, the cable could easily become overheated (due to excess current) and burn or rupture its insulation.

Answer 2

$\texttt {The function of fuse is usually to prevent fire}$
$\texttt {that's the basic protection a fuse offers}$
$\texttt {between power supply and appliance there maybe}$
$\texttt {a few seed of metres of cable if a short circuit}$
$\texttt {occurs in the appliance the cable Court easily become overheated}$
$\texttt {and burn or repture it's insulation}$