You want to wait to sell XYZ because you think it’ll rise to a higher price.
XYZ is currently trading at $10 per coin. You want to wait to sell XYZ because you think it’ll rise to a higher price. To help protect yourself in case XYZ reverses itself and begins falling, you set a stop price at $8. You also don’t want to receive less than $7.95 per XYZ, so you set a limit price at $7.95.