Check Emails Of Multiple Email Addresses At One Address

How to check Emails Of Multiple Email Addresses At One Mail address so as you dont need to log in to each and different email account seperately daily to check for all mails.You can consolidate all your emails to one mail address with the help of gmail.As i have 4 email address and chek my mails twice a day,so i have to login 8 times but now i am using gmail feature and use to login only one