What it is: A global point-of-presence where AWS serves cached content closer to users (commonly used by CloudFront).

What it’s for:

• Reduce latency for static and cacheable content.
• Improve user experience worldwide.

Key ideas:

• Users hit the edge first; if content is cached, it’s served immediately.
• If not cached, the edge fetches from the origin.

Hard words:

• *edge* /edʒ/: “biên” (gần người dùng)
• *cache* /kæʃ/: bộ nhớ đệm
• *origin* /ˈɔːrɪdʒɪn/: nguồn gốc (server/bucket gốc)