What font is recommended for headlines and titles in SD Typography?

Open Sans is the recommended font for headlines and titles in SD Typography due to its modern, clean, and legible design. This sans-serif font is specifically chosen for its versatility across various media and its readability at different sizes, which enhances the visual impact of headlines and titles. The open letter forms and smooth curves contribute to a friendly and approachable aesthetic, aligning well with contemporary design practices. Using Open Sans ensures consistency and clarity in communication, key aspects of effective visual design in official documents and branding materials.