Stay Awake will prevent your Mac from falling asleep.
This is useful for when you have a long process running on your machine and don't want it to go into standby till you're done.
Just click on the icon on the toolbar: The first menu item shows the current status and you can click it to toggle between staying awake and able to sleep
🔴 Means your machine will stay awake
🟢 Means your machine can fall asleep
cheers.
Stay Awake is inspired by caffeine - the original stay awake program for the Mac. You can find that here: https://www.caffeine-app.net