An email is a message sent electronically between computer users via a network. It has become a widely used form of mass communication globally due to its speed. Some important email etiquettes include using a clear subject line, professional salutations, thinking carefully before hitting "reply all", using a professional email address, using exclamation points sparingly, being cautious with humor, tailoring messages for different cultures, replying even to accidental emails, and adding the email address last to avoid accidental sending.