In some countries like England or Germany is still known as Google Mail does that mean, is the union between Google and e-mail comes from there Gmail.
Gmail is free, so you will not pay for it.
To create an email account we have to go to www.gmail.com and there select create email account.
Google offers Gmail service in several languages including Persian, the most recent.
With respect to storage Gmail account with 7.6 GB of storage and growing so you will not have space problems.
If you need more storage space you have Gmail for Work service.
Create your account now www.gmail.com