Chlorine bleach usually comes in a liquid form, but can occasionally be found in a powder form. Chlorine bleach contains sodium hypochloride diluted with water. This type of bleach is very powerful and can also disinfect laundry, but isn't safe for some fabric types.
Oxygen bleach is safe for use on most fabrics and is sometimes known as color-safe bleach or all-fabric bleach. Even this type of bleach may not be safe for all fabrics.