Webmail accounts vs email apps
If you've used Gmail, Outlook.com, Hotmail.com, or iCloud, then you've used webmail. To get to your webmail account, you access the Internet and sign in to your email account.
If you have a PC or Mac, you've probably used a program like Outlook, Apple Mail, or Thunderbird to manage your email. Outlook, Apple Mail, and Thunderbird are email apps: programs that you install on your computer to manage your email. They interact with an email service such as Gmail or Outlook.com to receive and send email.
You can add any email account to your email app for it to manage your email. For example, you can add webmail accounts - Gmail, Outlook.com, Hotmail.com, AOL, and Yahoo - to the Outlook or Apple Mail app to manage your email, and you can add work email accounts.
Adding webmail accounts to email apps such as Outlook, Apple Mail, Thunderbird
When you add your email account to your email app, it will usually attempt to set it up with IMAP access, without any input from you.
If the email app has difficulty adding your email account, it's usually because the email account is set up for POP access. In this case, you need to go to your email provider and find out the name of their POP and SMTP server so you can enter the info into the email app. The info usually looks something like this:
Incoming Mail (IMAP) Server: imap..com
Incoming (POP) Server: pop..com
Outgoing Mail (SMTP) Server: smtp..comers (ISPs) give you email accounts that use POP.