Interactive whiteboards allow teachers to display computer content for students to see and record lessons for later review. They come in brands like SMART board, ACTIVboard, Ebeam, and Webster. All are large but compact to fit in classrooms, with some mounted on walls and others on movable stands. They also have ledges for special whiteboard pens and erasers. Interactive whiteboards support teaching by saving lessons for absent students, displaying presentations, diagramming activities, using graphics to aid ESL and special needs students, and reinforcing skills through interactive websites.