Fusible alloys are a type of metal alloy that has a low melting point and is used in soldering. Soldering is a process of joining two or more metals together by melting and flowing a filler metal into the joint. Fusible alloys are commonly used in soldering because they have a low melting point, making them easy to work with. They are also resistant to corrosion and oxidation, making them ideal for use in electronics and other applications.