Question about reading strings

New to programming but I kinda got the basics. But my question is about character arrays. In this statment:
char name[21]

cout << "what is your name? ";
cin >> name;
cout << "Good morning " << name << endl;

I really dont see the purpose of char name[21] other than telling how many characters u can use. Wouldnt defining name be easier or am I missing something here?

also is there a way to link these forums to a mobile device?

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