eli5 Is there a reason that the decimals of pi go on forever (or at least appear to)? Or do it just be like that?

Question

Edit: Thanks for the answers everyone! From what I can gather, pi just do be like that, and other irrational numbers be like that too.

In: 5168

Answer 1

Irrational numbers be like that. No exact ratio using integers is possible.

This is slightly different from endless decimals, rational numbers like !/3 or 3/7 that just never can be expressed in terms of a ratio over 10 (in base ten). 3/7 in base 7 would be 3, and 1/3 in base 3 would be 1, but then 3/10 would be an endless number in either of those bases.