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Someone secretly sits between you and the service.

Definition

In a man‑in‑the‑middle (MITM) attack, an attacker intercepts or alters communication between you and a website/app.

In plain English Someone secretly sits between you and the service.

Why this matters

Why it matters: It can expose private messages, passwords, or payment data—especially on insecure networks.

Example

Example: A fake Wi‑Fi hotspot intercepts traffic to capture logins.