Digital marketing is the marketing of products or services using digital technologies, mainly on the Internet, but also including mobile phones, display advertising, and any other digital medium.
Web development is a broad term for the work involved in developing a web site for the Internet (World Wide Web) or an intranet (a private network). Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications (or just 'web apps') electronic businesses, and social network services.
Email marketing is one of the best converting marketing channels. By sending regular updates to your email subscribers you can build and nurture a relationship. By providing value with your email updates you can build trust – eventually, you will be able to turn a percentage of your audience into customers.
SEO is the process of optimizing content or websites so that they show up in search results in search engines like Google. Search engines decide which websites to show for a search term based on keywords mentioned on the website and links that refer to this website.
SEO describes the process of getting unpaid traffic from search engines – SEM refers to the paid traffic from search engines. The most common form of search engine marketing is probably Google AdWords for the simple reason that Google is by far the most used search engine.