What are the bumps at the end of computer cables?

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COMPUTER CABLES

Tripp Lite TrippLite U022006 Switches Cables Computer 6ft. (TRPU022006ZQ) USB 2.0 Cable

USB 2.0 Cable, Manufacturer: Tripp Lite, PN: TRPU022006ZQ, UPC: 20037332100010

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$1.95 - $11.21

Belkin F3G11701 Switches Cables Computer 6-pin(M), 6-pin(F) 1-ft, Black (F3G11701ZQ) PS/2 Cable

PS/2 Cable, Manufacturer: Belkin, PN: F3G11701ZQ, UPC: 10722868109134

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$15 - $25

Raritan Paragon II Computer Interface Module (CIM) for PS/2 (P2CIM-APS2) PS/2 Cable

PS/2 Cable, Manufacturer: Raritan, PN: P2CIM-APS2

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$152 - $170