Web technology refers to the tools and techniques used for communication over the internet between different devices. It includes markup languages like HTML, CSS, and XML for front-end development, programming languages like Perl, C#, Java, and .NET for back-end development, and web servers and databases to handle requests and store data on a computer network. Web technology can be classified into components that make up the world wide web like browsers, servers, web pages, and web development, which involves both front-end and back-end development.