A contractual or policy commitment from a software vendor that defines the maximum time it will take to acknowledge, respond to, or resolve a reported support issue. SLAs are typically tiered by severity: a booking system outage during peak hours may carry a 1-hour response SLA, while a cosmetic UI bug might have a multi-day resolution window. For tour and attraction operators, SLAs matter most during high-traffic periods like holidays or event weekends when a support delay can directly result in lost revenue. Vendors without published SLAs often rely on best-effort support, which provides no accountability when response times fall short.