Apps should always be kept up to date, not only in terms of security, but also to fix bugs or have the latest features. The Google Play Store which is located on the Samsung device provides the apps with updates automatically.

If this is not desired, the automatic app updates can also be deactivated.

Note: By default, apps are only automatically updated over the wireless network, but in addition to disabling automatic updates, updates can also be downloaded over the mobile data network.

Android 10 (One UI 2.0)
Step 1:  Open the  Play Store
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Auto-update apps
Step 5:  Choose between  Over any network ,  Over Wi-Fi only  and  Don´t auto-update apps
Step 6:  Confirm with  Done
  1. Open the Play Store
  2. Open the menu
  3. Open the Settings
  4. Tap on Auto-update apps
  5. Choose between Over any network, Over Wi-Fi only and Don´t auto-update apps
  6. Confirm with Done

Samsung Instructions