The question splits people into two camps: one considers an antivirus mandatory, the other a relic. Both are partly right, and the answer depends on the system, the habits and what exactly you are afraid of.
Where it genuinely helps
- Pirated software and cracks. The most common route by which something unwanted arrives on a computer.
- Files from strangers. Attachments, downloads from unfamiliar sites, installers from search results.
- Flash drives and other people's disks. A rare route today, but still alive.
- A computer used by several people, including children installing things themselves.
Where it does not help at all
| Threat | Does an antivirus help? | What does |
|---|---|---|
| A password entered on a fake page | No | Checking the address, a password manager |
| A call “from the bank” | No | Hanging up and calling back yourself |
| Replaying leaked credential pairs | No | Unique passwords |
| A hijacked account | No | A second factor |
| Downloaded malicious software | Yes | Plus not downloading it in the first place |
| Ransomware | Partly | Backups matter more |
The short answer by system
- Windows. The built-in protection is adequate for most people. A third-party product makes sense for pirated software, several users, or if something has already happened once.
- macOS and Linux. The built-in mechanisms are usually enough; the main risk is what you install yourself.
- Phones. An antivirus is close to useless: apps are isolated from each other. What matters is installing from the official store and reviewing permissions.
Gives less than expected
- A paid suite “for everything at once”
- Two antiviruses at the same time
- An antivirus on a phone
- A free product with a toolbar
Gives more
- Updates installed on time
- Unique passwords and a second factor
- A verified backup
- The habit of checking the address bar
What actually protects against ransomware is covered in backups, and why updates matter more than a scanner in updates.