Knockdown texture is a type of wall texture that makes your walls look more interesting and less boring. It's usually used when someone is trying to fix up their home or apartment, or when a new building is being built.
The texture gets its name from the way it's applied to the wall - a special tool is used to "knock down" the peaks of the texture, leaving a more flattened surface. When it's done, the texture will have a cool pattern that looks kind of like the swirls in a cupcake icing.
This texture can be made with different materials like drywall mud or joint compound. Once the base coat is applied, it is allowed to dry for a little while. Then, a tool called a "knockdown knife" is used to flatten the texture by dragging it across the surface. If the texture is too thick, it can create a "heavy knockdown" effect. Conversely, if it's too thin, it won't have any pattern at all.
Overall, knockdown texture is a really fun and creative way to add some personality to your walls.