Here’s the difference:
As you can see, the Gentle reminders notification is much less intrusive, but still does the job of letting you know about upcoming events.
To enable gentle reminders:1. Click the Settings cog button > Settings.
2. Select the Labs tab.
3. Find and enable the Gentle reminders lab.
4. Click Save.
To configure gentle reminders:1. Click the Settings cog button > Settings.
2. Select the General tab.
3. Find the Gentle reminders (labs) section.
4. Tick or un-tick the options to suit your preferences. Leave the Show floating desktop notifications option ticked to get a pop-up reminder (Google Chrome users only).
This lab is most effective when used in Google Chrome, as it supports floating notifications. However, if you are not a Google Chrome user, you will still see the blinking browser tab with the name of the event, and the full pop up notification when you open the tab.
Tip: Clicking on the floating notification will make it disappear, then take you to your calendar and prompt you to have another reminder in five minutes.