Flat design is a term for a minimalist design language or design style commonly used in graphical user interfaces and in graphical materials such as posters, arts, guide documents and publishing products.
Flat design is a user-interface modern design style known for the following traits:
1) A modern and digital-friendly aesthetic.
2) Minimalist styling.
3) Ample white space.
4) Symmetrical grid-based layouts.
5) 2D elements.
6) Bright, high-contrast colors.
7) Bold, readable typography.
8) Symbolic icons.
9) Simplicity (so no gradients, textures, abstract forms).
Because of its focus on cleanliness and order, flat design creates very functional websites, where the user journey is clearly laid out and the interface provides little to no distractions or friction.