Alsalamu Alikom is the greeting of Islam and it means " Peace be upon you " ,Nowadays it becomes more common . As all Arabs say it not only Muslims .And when someone say it to u " Alsalamu Alikom " you have to reply saying " Wa Alikom Alsalam " which means " Peace be upon you too " .

islamic greetings ,,when we say assalamu alikoum to someone , he/she say ( wa'alikoum assalam )

Its simple, you got to say one of the following: 1- Wa allaikom asalam wa rahmato allah w barakto 2- Wa allaikom asalam wa rahmato allah 3- Wa allaikom asalam the first one is the perfect form, but the second and third are more concise.

we alaukom alssalam