There are two main types of easels used by artists. Tripod easels, as the name suggests, have three legs, and may include crossbars to make the easel more stable. H-Frame easels, again as you'd expect, resemble a letter 'H' and are constructed of two vertical posts with a horizontal crossbar support. Both types of design may have extra features for rotating the canvas and adjusting it horizontally and vertically.
Children's easels are generally simpler, smaller and more durable; the younger the target age range, the more so in all respects. Finally, tabletop easels are designed for artists with a limited amount of space, enabling them to angle their canvas while fitting onto a table or desk.