Gesso is an important art supply to get your canvas ready for painting. Gesso is very similar to white acrylic paint, only thinner. It dries hard, making the surface more stiff. Gesso prepares (or “primes”) the surface for painting, making the surface slightly textured and ready to accept acrylic paint. Without gesso, the paint would soak into the weave of the canvas.
The word gesso is a noun, but many artists also use it as a verb. For example: “You need to gesso your canvas before you paint.”
If you need to prepare your surface for acrylic or oil painting, this a good primer to use with a matt finish and slight tooth. Apply in layers as necessary.