Besides helping Gmail apps run efficiently, syncing data allows you to use your Gmail account between devices seamlessly.
However, syncing may get costly, depending on your mobile and data plans.
In some cases, not all data may be needed for your convenience, either.
It is possible to manage the syncing of your messages and other data forms on your Gmail apps.
This is where turning off the auto-sync feature will be most useful to you.
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What Auto-Sync Does
When your phone synchronizes data, Gmail apps refresh their data.
Update notifications are sent to you.
you might jump into the synced data on other devices when you sign on with your Gmail account.
Which Apps Sync
Gmail apps are by default set to sync with your Google account automatically.
Auto-sync can be turned off and on selectively for each of the Gmail apps.
Other apps sync, depending on their nature.
It just stops the app from refreshing your data automatically.
With this option, only emails will be synced.
Finish by toggling off every account or app that you dont want to synchronize.
Keep the email option on.
These steps apply whether you are using Android Oreo or higher.
But the simple fact that this feature is available doesnt mean that you have to use it.
If it is convenient for you to use, use it!
If not, simply turn it off and stash your data usage.