Antivirus and security suites are apps that a person installs on a home PC or phone to protect it from harmful software and online fraud. A security suite is a bundle: an antivirus, a VPN, a password manager and alerts about identity theft, sold together under one yearly subscription. In Indian shops it is usually called simply "antivirus" or "internet security".
The oldest part is the antivirus. Harmful software of any kind is called malware. The antivirus checks every new file against a list of known malware, which the maker updates many times a day. New malware is not yet on any list. So modern antivirus also watches what each program does. A program that suddenly starts locking hundreds of files is stopped, even if no list knows it. This is how suites catch ransomware.
Take, for example, a college student in Guwahati who downloads a free copy of a paid video game. The file contains ransomware. When he opens it, the program starts to encrypt the photos in his Documents folder, one after another. After a few files, the suite notices the pattern. It stops the program and moves it to quarantine, a locked folder where it cannot run. Some suites also keep spare copies of files, and can put back the few photos that were already locked. The student sees one message: "Threat blocked".
The other parts of the suite deal with other risks. Web protection checks each website before it opens, and blocks known phishing pages, such as a fake bank login page. The consumer VPN encrypts the connection on public Wi-Fi. Identity theft protection warns the person when their email, phone number or PAN shows up in a data leak, using the same kind of searches as dark-web monitoring. Some suites also include parental controls and online backup.
Who pays? Families buy a licence for a fixed number of devices, often in a shop together with a new laptop, or online. Some internet providers sell a suite as an add-on to home broadband, and add its fee to the monthly bill.
Is it still needed? Windows and Android now come with free built-in protection, so a basic antivirus alone matters less than it used to. People buy suites mainly for the extras: the VPN, the identity alerts and the warnings about fraud.
A suite is the home version of the endpoint detection and response (EDR) software that companies use. EDR records everything a laptop does, so that a security team can investigate an attack later. A suite has no security team behind it. It must decide and act on its own.