Caffeine is pretty famous utility designed for Linux to disable screen-lock and screensaver temporarily so you can focus on what you are doing on your system. It stays in the panel and fairly straightforward application. It can be useful either you are working or listening or watching something that players don't prevent computer from going into sleep mode or prevent screensaver.
Without caffeine you need to go to power management in the system settings then disable sleep and also screensaver, Caffeine solves this issue and it comes in handy as well because you can activate/deactivate it right from system tray just with a single click.

Available for Ubuntu 17.04 Zesty/16.04 Xenial/14.04 Trusty/Linux Mint 18/17/other related Ubuntu derivatives
To install Caffeine Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

That's it
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