As-salamu-Alaikum Wa-Rahmatullahi Wa-Barakatuhu.

               

This one is very well known by both Muslims and non-Muslims. It means "peace be upon you". You might think: When do you guys even use this? "As-salamu-Alaikum" basically replaces the classic "hello"or "whats-up bro!". We use it when meeting or greeting people and we also use this one when saying goodbye. Depending on where you live and on whether you are a man or a woman, it can be accompanied by a handshake, a hug or 24 kisses.

Fun fact: 

           For the more advanced people there is also"As-salamu-Alaikum Wa-Rahmatullahi Wa- Barakatuhu"which is used in the same situation. But you add something more to the meaning. This extended version means "May the peace, the mercy, and the blessings of Allah be upon you".