Ableism is a form of discrimination toward people with disabilities either physical or mental. Generally, ableism prevents disabled persons from having the same access to rights and services that average people have no problems obtaining.
Disabled visitor at hotel: "I'd like to rent out a room?" Receptionist: "Sorry, all rooms are currently taken." Average visitor at hotel AFTER disabled person leaves: "Hey, I'm interested in renting a room?" Receptionist: "Sure, that'll be $500." Average person: "Here you go." Receptionist: "Here's the key, enjoy your visit. It's room 112A."