Web accessibility (a11y) is the practice of ensuring there are no barriers that prevent interaction with, or access to, websites on the World Wide Web by people with physical disabilities, situational disabilities, and socio-economic restrictions on bandwidth and speed.

Key Principles

1. Perceivable: Information and user interface components must be presentable to users in ways they can perceive.
2. Operable: User interface components and navigation must be operable.
3. Understandable: Information and the operation of user interface must be understandable.
4. Robust: Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.

Building accessible websites benefits everyone, not just those with disabilities.