- Radicals are atoms, molecules, or ions that have unpaired electrons.

- They are highly reactive and can undergo various chemical reactions, either combining with other radicals to form stable molecules or reacting with other molecules to form new compounds.

- Radicals are often intermediates in chemical reactions and play important roles in combustion, polymerization, and many other chemical processes.

- Free radicals, which are radicals that exist independently, can also be produced in the body during metabolism and can cause oxidative damage to cells and DNA.