Why do people use scientific notation to write very large/very small numbers?

Question

I've seen numbers like these and 10 to the power of any some numbers is used sometimes for very large/very small numbers. Any reason this is used?

Answer 1

A simple example should be enough to illustrate why. Consider Avogadro's constant, $L$. Would you rather see $$ L = 6.022141\times 10^{23} $$ or $$ L = 602214100000000000000000 $$ when reading an article, book, etc.?