What is an antivirus: a program that slows down a computer, siphoning money from a naive user, or software that must be installed? Let's take a look at antivirus programs in modern realities, are they really needed !?
Windows 7 and higher have built-in protection UAC (User Account Control Settings) for a long time, in Russian "User Account Control". This function asks for permission to run any program that requires Administrator rights. Under the administrator, the program can make changes to the system, but the virus needs rights.
Also, the presence of a publisher is checked, i.e. certified software developer. I think you've seen the windows asking "Allow this app from an unknown publisher to make changes on your device?" :
You do not need to launch applications without a publisher if you are not sure of what you are doing. Hence, the virus simply cannot run on a computer with UAC enabled !? In theory, a "scary" virus cannot start WITHOUT YOUR PERMISSION!
But in practice, many programs downloaded from the Internet do not have a publisher, or they can still be infected with a virus or rootkit, and for the application to work, you will need administrator rights, which you, kindly and without hesitation, provide ... They can also work, supposedly harmless viruses, adware, spyware and "malware", which, even without being embedded in system files, can ruin your life or steal confidential information.
Antiviruses scan all programs and files that you run for signatures of known malware and for the presence of suspicious code using heuristic analysis.
Antivirus against Safe Browsing in the browser
Another serious blow to antivirus developers is the SafeBrowsing function in chromium browsers: Google Chrome, Opera, Yandex Browser, and others. When you download a file from the Internet, the browser checks its database of suspicious sites and links and does not allow an infected program to be launched or an archive with dangerous content to be opened. This is a pretty reliable feature that always works "on business", not like UAC.
Moreover, browsers do not allow sites with viruses without your consent, showing a corresponding message on the full screen. But the "safe surfing" function is far from perfect and does not protect against all threats. For example, NOD32 antivirus protects against visiting dangerous sites even when the browser quietly passes:
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