Smart fonts, also known as intelligent fonts or advanced fonts, refer to fonts that have built-in programming or functionality that allows for advanced typographic features such as ligatures, contextual alternates, and swashes. They enable designers to create more complex and visually appealing designs without having to manually adjust individual letters or characters. Smart fonts can also improve readability and accessibility by automatically adjusting spacing and layout based on specific languages or scripts. They are commonly used in print and digital media, and have become an essential tool for designers and typographers.