What is a PCIe x1 slot used for?

Related questions

1. Which is faster PCI or PCIe?
2. Are there different types of PCI Express slots?
3. Will PCIe 2 work in PCIE x16?
4. Is PCI Express compatible with PCI?
5. Can you put a PCI card in a PCIe x16 slot?
6. What is the difference between PCI and PCIe?
7. Is PCI Express 4 backwards compatible?
8. Is PCI obsolete?
9. What is PCIe x4?
10. Can PCIe x4 fit in PCIE x16?

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3. #about
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5. #graphics
6. #standard
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9. #direction