A font is a complete set of characters—letters, numbers, and symbols—that share a common weight, width, and style, such as 10‑pt Adobe Garamond Bold.
Typefaces (often called type families or font families) are collections of fonts that share an overall appearance, and are designed to be used together, such as Adobe Garamond.
A type style is a variant version of an individual font in a font family. Typically, the Roman or Plain (the actual name varies from family to family) member of a font family is the base font, which may include type styles such as regular, bold, semibold, italic, and bold italic. If a font doesn’t include the style you want, you can apply faux styles—simulated versions of bold, italic, superscript, subscript, all caps, and small caps styles.
Typefaces include many characters in addition to the ones you see on your keyboard. Depending on the font, these characters can include ligatures, fractions, swashes, ornaments, ordinals, titling and stylistic alternates, superior and inferior characters, old‑style figures, and lining figures. A glyph is a specific form of a character. For example, in certain fonts, the capital letter A is available in several forms, such as swash and small cap.
To make fonts available to Photoshop and other Adobe Creative Suite applications, install them in these system folders: