====== Key Pair ======

**What it is:** A public/private key pair used to securely connect to EC2 (commonly via SSH).

**What it’s for:**
  * Authenticate SSH access without passwords.
  * Secure initial access to instances.

**Key ideas:**
  * You keep the **private key**; AWS stores the **public key**.
  * Losing the private key can mean losing access (unless you have other access methods).

**Exam cues:**
  * “SSH access to EC2” → key pair + SG rule for port 22.

**Hard words:**
  * *authenticate* /ɔːˈθentɪkeɪt/: xác thực
  * *private key* /ˈpraɪvət kiː/: khóa riêng
  * *public key* /ˈpʌblɪk kiː/: khóa công khai