Article: Gmail has three categories of mails sorted for the incoming mails such as Primary, Social, and Promotion. You can add more categories or combined into one category. Creating Labels will help you to determine which mail is spam and which mail is important. Go to Settings -> Labels -> Create New Label. When you make a Label, you can select a mail and organize it to be sent to a certain Label upon the arrival by clicking on the down arrow beside the search box and putting the email address or a group of phrase.

What is a summary?
Sort your emails to help you prioritize what you deal with. Add Labels in the settings.