Q.Explain VoIP.

Imagine you are holding a telephone handset. Your voice travels as an electrical signal along a copper wire, all the way to the other person. That is the old way — a dedicated physical path for your conversation, held open for the entire call. Now think about how you send a photo to a friend on WhatsApp. You do not need a dedicated wire for that photo. Instead, the photo is chopped into tiny digital packets, each one stamped with your friend's address, and these packets travel through the internet, possibly taking different routes, before being reassembled at the other end.

Voice Over IP (VoIP) does exactly that, but with your voice. Instead of a dedicated telephone line, it uses the same internet connection that carries your emails, web pages, and streaming videos. Your voice is converted into digital data, broken into packets, and sent over the Internet Protocol (IP) network — hence the name.

The precise meaning is this: VoIP is a technology that allows you to make voice calls using a broadband internet connection instead of a regular (analog) phone line. The "IP" part refers to the Internet Protocol, the set of rules that governs how data is sent and received across the internet. So, your voice becomes just another type of data traveling alongside everything else.

Why does this matter? Because it fundamentally changes the economics and flexibility of communication.

• Cost: A traditional phone call, especially a long-distance or international one, uses a network that is expensive to build and maintain. VoIP calls, by contrast, travel over the internet you already pay for. This is why services like Skype, WhatsApp calls, and Zoom meetings are either free or very cheap, even across continents.
• Integration: Your voice call is no longer a separate service. It can be combined with video, file sharing, and text messaging in a single application. This is why you can be on a video call, share your screen, and type in a chat all at once — it is all just data.
• Flexibility: You are not tied to a physical phone jack. You can take your VoIP number anywhere you have an internet connection — a hotel in another country, a coffee shop, or your mobile phone's data plan. Your "phone" is now a software application. …