Figma is a design tool that saves a lot of time and even if you are not a designer, it helps you in design process and building great UI/UX experiences. You can use Adobe Photoshop or Adobe illustrator for design work but Figma is a cross platform app that can be used as an alternative to those premium apps.
It allows vector based design creating and editing. You have a variety of canvas options that can be predefined for iPad, iPhone, Android, tablet or desktops or you can use custom art board. You can make use of grids system and create a lot of stuff from icons to websites designs to complex UI/UX experiences along with easy prototyping. I am impressed with ease of use that Figma offers.