Why is skiing easy but difficult to walk on snow?

Ice skates have less surface area in contact with the ice.

I'm a figure skater, and I think for most people who have never ice skated before, walking on frozen ice is easier, because you are use to walking, and you have more of you touching the ice, while in ice skating you only have the bottom of a blade

but the blade is sharp metal so it grabs the ice in a way shoes slip n slide on ice