Emailing is a system for sending messages from one individual to another via telecom links.
Web design require many different skills and disciplines in the production and maintenance of websites.
Web development refers to the tasks of developing websites for hosting via intranet or internet.
A mobile application, is a type of application software designed to run on a mobile device.
Optimization is the action of making the best or most effective use of a situation or resource.
Marketing refers to the activities of a company associated with buying and selling a product or service.