Answer:

Function is significant in showing real-life situations because it is always around us whatever the situation may be. For example, it can be showed in a trait of a person (loyalty), because when we commit to someone, we should be loyal to his/her, this is an example of one-to-one correspondence. Another example is the religion, because a person can never have two religions, this is an example of many-to-one correspondence. Function is also significant because we can use it in measurements, calculating money, time, distance, etc.