What Is Ransomware?

Ransomware is a type of malware that blocks access to files or systems and then demands payment to restore them. In many cases it encrypts files so they cannot be opened normally.

How Ransomware Usually Gets In

Ransomware commonly spreads through phishing emails, fake downloads, malicious attachments, weak remote access setups, or software vulnerabilities that were never patched.

It rarely arrives with a label saying what it is. It usually comes disguised as something ordinary enough to get opened, installed, or clicked.

What Happens During an Attack

Once active, ransomware may encrypt files, rename them, leave ransom notes, and in business settings sometimes spread across multiple systems. Modern attacks can also involve data theft before encryption, so victims are threatened with both downtime and public exposure.

That double pressure is one reason ransomware is treated so seriously.

Should You Pay the Ransom?

Paying is risky. It does not guarantee your files will be restored, and it can encourage more attacks. Some victims pay and still do not get working decryption tools or lose data anyway.

That is why strong backups, patching, and account security matter more than hoping a ransom can be reversed later.

How to Reduce the Risk

Keep software updated, use strong passwords, turn on two-factor authentication where possible, and be skeptical of attachments and links. Backups are especially important. If backups are isolated and recent, the damage is much easier to recover from.

For organizations, the list is longer, but those basics still matter at the personal level.

Summary

Ransomware is malware that locks files or systems and demands payment. Prevention matters because recovery can be expensive, uncertain, and stressful. For nearby topics, see What Is Malware? and What Is Phishing?.