I was confused among the word of "clarification"and"explanation",appreciate if you can advise how indetify.

clarification and explanation both mean try to make complex thing easier to understand,please kindly to tell the differences and make some examples for both.

两个都是有解释的意思，但是实际的区别在哪里？什么情况下可以都用，什么情况下只能用其中一个。