Email hosting is just what the name says. You have your email hosted with a company. Most people do this simply with the hosting company they are using to also host their domain name, etc. But some choose to use google or a third party of their choice.
A email hosting company - They offer such program and tools which you can use for MMA or various other type of business. The services can be mass mailing, dedicated mailled, newsletter building company and such and such.
Heard about a company named Mailchimp? yes! they use our email hosting servers. They offer people newsletters or signup mail and else. Depends on high quality mail distribution servers.
Well, it's an example. Many people use Email Hosting service for Advertising and much more.
Email hosting plans are plans which will give a secure and personalised email address because emails are important means of communication in business and portraying a right image is necessary for the growth and goodwill of the business.
Email hosting can be defined as a server space where your emails are kept and stored securely. For example, if someone sends you an email, then that email is transferred to that email server where that email is saved for the further purpose.
Email hosting is the basic service where the business can use it for the transaction mail sending or the scheduler type of mails. So the mails can be commercial or in house. The hosting service just ensures that they are delivering the mails at higher delivery percentage. You can find such services like Mailgun, Mailjet and Mendrake email hosting. Those are not cheap definitely but they can be good option for low cost mail sending.