What is the role of a fuse used in series with an electrical appliance? Why should a fuse with a defined rating not be replaced by one with a larger rating?

(N/A) fuse is a safety device used in series with an electrical appliance to protect it from damage caused by short-circuiting or overloading.
It is designed to handle a specific maximum current rating.
When the current flowing through the circuit exceeds this rated value,the fuse wire melts due to the heat generated,thereby breaking the circuit and preventing damage to the appliance.
If a fuse with a larger rating is used,it will not melt when the current exceeds the safe limit of the appliance.
Consequently,the appliance may get damaged or catch fire because the fuse fails to perform its protective function.