Internet, Web Technologies and Digital Communication
This domain separates the network from the service, explains addressing and URLs, and covers professional online communication. Questions often ask you to label URL parts, choose an email protocol, or identify a safe browsing practice.
Core rules and concepts
- The Internet is a global network of networks using TCP/IP. The World Wide Web is a hypertext service that runs on it; they are not synonyms.
- An ISP provides access. An IP address identifies a device; DNS translates a domain name into an IP address.
- A URL contains a scheme, host, optional port, path, and query. HTTP is unencrypted; HTTPS uses TLS encryption in transit.
- A browser requests and renders pages; a search engine indexes and returns links. Search operators such as site:, filetype:, and quoted phrases narrow results.
- Email: SMTP sends mail; POP3 and IMAP retrieve it. IMAP synchronizes folders across devices; POP3 often downloads and may remove server copies.
- Digital communication includes email, chat, VoIP, video conferencing, and blogs. Netiquette means clear subject lines, brevity, no all caps, and respect for privacy.
Worked example
Consider https://www.example.com/products/item?id=42. Reasoning: https is the scheme, www.example.com is the host, /products/item is the path, and id=42 is a query parameter. A browser requests this URL; a search engine would have returned the link in the first place. The https scheme protects data in transit but does not prove the site is honest.
Traps that cost marks
Do not say the Internet and WWW are identical. SMTP sends; it does not fetch inbox mail. POP3 and IMAP are not interchangeable. Do not treat a domain name as a URL or a browser as a search engine.