The time it takes a data packet to travel from source to destination. In the cloud, it is minimized by deploying resources in regions close to end users.
AZ-900 and CLF-C02 use this to justify choosing a geographic region. CDNs (Azure CDN, CloudFront) reduce latency by caching content at edge nodes near the user. Question: how do you reduce global latency? Answer: CDN + a nearby region.
Latency is a concept that can show up on the exam. Check the full guide to see it in context.