Most computer fonts (like .ttf or .otf ) are . They store mathematical formulas (Bézier curves) that describe the shape of a letter. This allows them to scale infinitely without losing quality, but it requires a significant amount of processing power to render those shapes into pixels on a screen.

Because VLW files are bitmaps, they don't scale. If you create a font at size 12, it will look tiny on a high-resolution screen or huge on a small OLED. You usually need to generate multiple .h files for different sizes (e.g., FontSmall.h , FontLarge.h ) and switch between them in your code.

Developed by Apple and Microsoft, these use mathematical curves to remain sharp at any size.