olemus
klientide nõustamise ja abistamise teenus, sageli ka telefonikonsultatsioonina, näiteks kasutajatugi riistvara tootjalt, tarkvara kirjastajalt, sisemiselt konsultatsioonipunktilt, õppeasutuselt, kolmandapoolselt tugifirmalt

Wiktionary:
a range of services providing assistance with technology such as televisions, computers, and software, typically aiming to help the user with a specific problem

ülevaateid
https://roicallcentersolutions.com/tech-support/help-desk-vs-technical-support/

https://www.momentcrm.com/blog/technical-support-vs-customer-service/

https://en.wikipedia.org/wiki/Technical_support

https://www.truppglobal.com/blog/customer-experience/technical-support-definition-types-role-in-business

https://neteffect.com/level-1-2-3-support/

https://www.guru.com/blog/what-are-the-types-of-technical-support/

https://www.eiresystems.com/8-tech-support-best-practices/