eli5: In programming, how does using “try and except/catch” blocks stop the program from crashing?

Question

eli5: In programming, how does using “try and except/catch” blocks stop the program from crashing?

In: 10

Answer 1

“Can you go to the store and buy some ice cream?”

vs

“Can you go to the store and buy some ice cream? If they don’t have any, just come back home.”