Why do designs change type size and weight?
Short answer
Changing type size and weight shows the different roles of headings, body text, and notes. It helps readers understand the order of information and find what they need.
How it works
Large type is easier to notice from a distance, and heavier type can stand out from its surroundings. Making headings larger than body text creates a visual hierarchy.
However, larger or heavier type is not automatically easier to read. Line length, line spacing, contrast with the background, and screen size also matter.
Key point
Type differences are used not only to attract attention but also to show relationships between pieces of information. A small, consistent set of roles is usually easier to understand.