Picking a good user interface typeface is crucial, as it represents the personality of an app or product. However, certain fonts are better suited for UI due to their legibility and versatility. Native system fonts have gained popularity in recent years, offering advantages such as reduced hosting requirements, automatic updates, and consistent rendering across devices. The most popular native system fonts include San Francisco, Roboto, and Source Sans Pro, each with its unique characteristics and strengths. When implementing system fonts, designers must consider the font family's design, weights, and variations to ensure a seamless user experience. Prioritizing fonts like San Francisco can simplify design decisions while still acknowledging the value of other fonts in the ecosystem.