Internet and World Wide Web (WWW) are different to each other.
Internet is the inter-connected networks or it is the network of the networks of millions of devices which are connected to each other by the means of the Internet whereas the World Wide Web is a service which includes data and information which is exchanged and can be accessed with the help of the internet.
The World Wide Web uses a language called HTTP(Hyper text transfer protocol) which is used to transmit the data and accessing the information which is present on the Internet. This information is accessed with the help of W.W.W.
Internet is a medium to exchange, providing or accessing the information which is on a system and these information on the website are stores in big data centers of the domain service provider called Server.
Interaction design can be understood in simple (but not simplified) terms: it is the design of the interaction between users and products. Most often when people talk about interaction design, the products tend to be software products like apps or websites.
