Why SRAM is used in cache memory?

Related questions

1. What does ddr4 RAM mean?
2. Why are SSD still so expensive?
3. Is ddr3 compatible with ddr4?
4. Can I use 1600MHz RAM on a 1333MHz board?
5. How does a SRAM work?
6. Why is SRAM so expensive?
7. Are there different types of ddr4?
8. Does ddr4 RAM speed matter for gaming?
9. Can I use ddr4 RAM in ddr3 slot?
10. Does SRAM need refreshing?

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15. #static
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18. #possible
19. #instead