Tweezers are a tool, usually made from metal, that can be used to remove hair from delicate areas. In Beauty, they are generally used to pluck hairs and refine the eyebrows.
After lots of use, your tweezers can build up hair and dead skin on the nibs. An effective way to clean your tweezers is to use rubbing alcohol to remove any build-up and prolong their usage. Over time your tweezers may lose their precision. Use a nail file to sharpen them back up easily.