comment is like how. it's not the same as what. you can say what with que(what), quoi(what?), qu'est-ce que(what is), qu'est-ce que c'est que (what is it).
c'est comment means 'how is it' in French.
The translation of "comment" from French to English is "how."
It is french and it means "do you understand/speak"
il allait comment = how was he?
Comment ça va ? : how are you?
'Comment dit-on ...' means "how do we say ..." in English.
Comment allez-vous? means: How are you?
"comment ça s'écrit ?" means "how is it spelled? / how do you write it?" in French.
comment y aller means 'how to get there' in French.
It means what is your name, to someone older than you or that you don't know well
Comment il s'appelle ? means What's his name?
"What is your name?" in French is "Comment tu t'appelles ?"