Sync
Synchronization
Keeping the same data up to date and matching across multiple devices or apps.
In Simple Terms
Sync is the mechanism that keeps data in separate locations matching and identical. For example, when a photo you take on your phone automatically shows up on your laptop or tablet, that's because the data has been synced over the internet. It's also common in calendar apps: add an event on one device, and it automatically appears on your other devices too.
Behind the Name
"Sync" is short for "synchronization," a word built from Greek roots meaning "together" (syn-) and "time" (chronos) — literally, "happening at the same time." That original sense of things lining up in time is exactly why the word fits so well in tech: when your phone and laptop "sync," they're keeping step with each other so both always show the same, up-to-date data.
Take a Closer Look!
Sync is the process of keeping data matching across two or more different devices or apps.
When data is added, changed, or deleted on one side, that change is sent over the network automatically or at set intervals, and the other side is updated to match.
Because this cycle of "detect a change, then relay it" repeats automatically, everything stays up to date at all times.
A simple way to picture it: it's like creating a "mirror image" of data kept in separate places.
Just as a change in one mirror instantly appears in the other, you'll see the same information no matter which device you check.
By the way, in programming there's also a term "synchronous processing," but it refers to something completely different from the data syncing described here.
Synchronous processing is about the order in which a program runs its steps — waiting for one operation to fully finish before starting the next. It has nothing to do with matching data between devices.
Both use the word "sync," but one is about keeping data content aligned, and the other is about how a program waits for tasks to complete — two unrelated mechanisms that just happen to share a name.