The most common form of boron is the compound borax, used for a variety of purposes ranging from cleaning and antiseptics to making glass and enamel.
There is a new procedure called boron neutron capture thearpy (BNCT) and it targets cancer cells. Boron is atrracted to cancer cells but no one knows why. It is also used in glass and ceramics and is a essential plant nutrient
In the nuclear power industry, boron is useful as it absorbs thermal neutrons very strongly, so it is used in control rods and sometimes as a soluble poison.