Roboto
Google Fonts · Christian Robertson · 2011

Google's flagship sans-serif is a highly versatile neo-grotesque built for screens and extensive reading across multiple scripts.
About
Roboto was designed as the default typeface for Android and has become one of the most widely used typefaces on the web, covering Latin, Cyrillic, and Greek scripts with consistent authority. Its blend of geometric structure and humanist detailing makes it legible at small sizes while remaining clean and professional at display scales. It is an excellent workhorse for UI design, long-form editorial, and any project requiring broad multilingual support.
Classification
Roboto combines a mechanical skeleton with largely geometric forms, but features friendly, open curves that prevent it from reading as purely cold or abstract. Its dual-natured character balances rationalism with approachability across a broad weight range.