What is ESD protection, ESD protection arrays, ESD protections circuit, diodes

 USBLC6 Series 2 Channel 5.25 V SMT Uni-Directional ±15 kV ESD Protection-SOT-666

https://www.futureelectronics.com/p/electromechanical--circuit-protection--esd-protection/usblc6-2p6-stmicroelectronics-6273460