What it is: A tool to visualize, analyze, and break down AWS costs and usage over time.

What it’s for:

• Find which services/regions/accounts cost the most.
• Detect cost spikes and trends.
• Plan optimizations.

Key ideas:

• Supports filtering and grouping (by service, tag, linked account).
• Useful for monthly reviews.

Exam cues:

• “analyze which service increased cost” → Cost Explorer.

Hard words:

• *visualize* /ˈvɪʒuəlaɪz/: trực quan hóa
• *break down* /breɪk daʊn/: phân rã (chia nhỏ)
• *trend* /trend/: xu hướng
• *spike* /spaɪk/: tăng đột biến