Summarize this article in one sentence.
" This is a basic, formal greeting you can use with men and women and in the vast majority of social situations.  Translated literally, this is a blessing that means "peace be upon you." It is most commonly used by Muslims greeting other Muslims, but it has also been used in other circumstances and situations, as well. In Arabic script, this greeting is written from right to left as: السلام عليكم This phrase should be pronounced as Ahl sah-LAHM ah-LAY-koom. " If someone says “as-salam alaykom” to you first, this is the phrase you should reply back with.  Translated literally, this is a return blessing meaning “peace be upon you, as well” or “and peace to you.” Again, it is most frequently used by Muslims greeting other Muslims, but it can and has been used in other contexts, too. In Arabic script, this greeting is written from right to left as: وعليكم السلام This greeting should be pronounced as Wah ah-LAY-koom ahl sah-LAHM.

Summary:
Greet someone with "As-salam alaykom. Respond to a standard greeting with "Wa Alykom As-slam.