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What is the role of fuse used in series ...

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

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A fuse is a current-conducting wire made of pure tin or of an alloy of copper and tin, has low resistance, and a low melting point. A fuse is rated for either 5 A or 15 A . When a current more than the rated value flows through it, the fuse wire melts and breaks the circuit. Thus, it protects the appliances [with which it is connected in series] from getting damaged. If a fuse is replaced by one with larger ratings, the fuse does not burn off and the appliances may get damaged.
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