We wear the masks
1. For protection
1.1. To help ourselves and others
1.2. To protect ourselves from injuries, toxic gases and infections
2. For hiding
2.1.To avoid recognition for what you do
3. For fun
3.1. To show them at celebrations and carnivals
4. To scare people
4.1. To hide the frightening appearance
5. For play acting, to be someone else
5.1. To conceal the emotions
5.2. Not to feel discomfort during communication