Helveticaneue-regular.ttf

The .ttf extension indicates it is a TrueType Font , a standard developed by Apple and Microsoft in the late 1980s to ensure consistent rendering across different screens and printers.

The default Android font, offering a similar clean feel. HelveticaNeue-Regular.ttf

If you don't have a license for the official .ttf file, these free or common fonts are often used as substitutes: Widely considered the closest free match. HelveticaNeue-Regular.ttf