What are Trailing Zeros?

Can you put a million zeros on the right side of a decimal number? Well, there are a couple of rules you have to follow to do that. One - it has to be on the right side of the decimal. Two- there can't be any numbers after all those zeros. Three - the zeros cannot change the value of the original number. So why do you need to know this? Because zeros are used for placeholders, but I don't think you want to write a million of them.