User Experience is the process of developing and designing a layout of a website (it can be social network, email blasts, advertising, mobile interface) that the visitor, client or public interacts with. The User Experience can be the physical clicking, viewing and requesting or tempting the user to act/interact with the design. It may capture or share data, images or messages. It is a concept based on aesthetics, research and intention and hoping to visually stimulate the user. I would even go so far to say that User Experience may constitute social media marketing, email correspondence and basic marketing which delivers the user/client to the web content.
Interaction Design are the features of the site, the mechanics of the movements and how data and information are transferred, collected, captured, tracked or information is distributed to or from the client/user.
Web design is the layout of images and content to display a given, topic, idea, product or service on a web platform. Anyone can web design. With the rise and ease of technology there are platforms with which anyone to publish information to the web. There are those that have the training and experience to develop for the web with specific aesthetic in layout, illustration, color theory, typography and formal art training. And there are those that are just pushing out information.
User Experience is the period of time when a user interacts with a web or interactive interface. Interaction Design is specific programming with visuals and content which may achieve information or create a give and take type of engagement. A great User Experience implicates a comfortable or successful interaction with said web site, information, messaging, presence, data transaction or messaging.