Slime activator is a solution that is used to make slime. It is typically made with borax powder and water. When borax is added to a solution of polyvinyl acetate (PVA), it causes the PVA to cross-link and form a slime. The slime activator can be made in a variety of different ways, and the ingredients can be adjusted to create different types of slime.
Slime activator is an important part of making slime because it is what causes the slime to form. Without slime activator, the slime would not be able to hold its shape and would be more like a liquid. Slime activator is also what gives slime its stretchy and gooey properties.