Gmail is one of the largest email service provider in the world and it has some excellent services available. These services encompass everything from lesser spam to more space, chat to email conversation and much more. It can also have Labels affixed to each email to make it easy for the emails of a certain Label be sorted. Labels can define, whether the email is related to work, personal life, friends etc.
Follow this step by step tutorial to learn How to create labels and sub-labels in Gmail.