The written promise of how fast a provider responds and how reliable a service will be, with what happens if they miss it.
Like the delivery window on a parcel: it states when to expect it, and what the carrier owes you if it is late.
A five-person law firm assumes its IT provider will answer the same day. During a court-filing week the server goes down and nobody answers for two days. The agreement never said how fast anyone would respond.
WILDCARD does not sign SLAs. Each card states the response expectations you can plan around, and the card tells you which support you are buying.
Do I need an SLA from my IT provider?
You need to know what to expect. Ask how fast they respond to something that stops work, what their support hours are, and whether that is a promise with a penalty or a target they hold themselves to.
Every WILDCARD card exists to solve one named problem. Find yours.