What does ‘slippage’ mean?

Slippage is the amount of price difference you are willing to pay if the price increases between the time you click swap and the time it actually goes through. If you put for example 10% that means you are willing to still purchase even though the price has increased by 10%. If the price has not increased by 10% then you get whatever it is under that range.
If you get any errors while buying or selling so you may need to increase the slippage.
Set Slippage 25% while trading RVL