Update Android on Samsung phones and tablets may or may not be straight forward or easy. If you have a newer Android Samsung phone or tablet, you will get a notification on your device telling you that a new update is available and the update will proceed automatically. But, those notifications will eventually stop and then it becomes more difficult (or impossible) to upgrade Android on Samsung devices.
How to update apps on Android phones or tablets? Most, if not all, Android apps receive updates periodically to fix bugs, improve performance, improve compatibility for new OS versions, add enhancements, etc.