A typeface is a collection of letters. While each letter is unique, certain shapes are shared across letters. A typeface represents shared patterns across a collection of letters.Typefaces that are selected for their style, legibility, and readability are most effective when following the fundamental principles of typographic design
System fonts come pre-installed on your computer or device. They typically have wide language support and no licensing costs for developers. Using the system default font in your app font unites the consistency of the platform with your app’s look and feel. However, because they appear in many places on devices, they may not stand out.
A basic style of typography effect i picked up while learning how to do these certain type of designs.