Leverage allows trading larger positions. Liquidation is the total loss of your position when the market moves against you.
Example
You open a long on ETH worth €1,000 with 10x leverage — so you only put up €100 of your own capital. If the ETH price drops just 10%, your entire €100 is gone: the position gets liquidated. At 2x leverage you would only be liquidated at −50%. That is exactly why leverage scales not just your profit but your risk — and the liquidation price creeps closer to your entry with every extra turn of leverage.