OpenType
OpenType is a cross-platform font format developed by Adobe and Microsoft in the late 1990s. It has the faculty to include an expanded character set and layout features to provide richer linguistic support and/or advanced typographic control such as various numeral styles, ligatures, small capitals and contextual substitutions. OpenType supports Unicode, which enables the fonts to contain more than 65,000 glyphs while ʻPostScript®ʼ fonts are technically limited to a maximum of only 256 characters. This means that a user does not need to have separate fonts for Western, Central European or other languages, but could have one single file which supports all these encodings. OpenType fonts, as a new industry standard, will work in all applications, however only some applications take profit of the advanced OpenType features, other applications will only use the first 256 characters.
OpenType Features
OFF
ON
picto All Caps [CPSP]
picto2 Case Sensitive Forms [CASE]

With both OpenType and other fonts, this function formats the text in uppercase. With OpenType fonts, it also applies ‘Case Sensitive Forms’ OpenType layout features for alternate uppercase positioning of punctuation, and spacing designed for all-cap use (not when text is typed in caps).

All Caps [CPSP]
 
picto Standard Ligatures [LIGA]

Numbers from 00 to 100 are automatically regrouped into all single shapes when "Ligatures" is turned on.  

Standard Ligatures [LIGA]
 
picto Superscript/Superior [SUPS]

Substitutes all figures with their inferiors letterforms, commonly used for chemical compounds, and as mathematical exponents. These designed glyphs match the weight of the numbers and are more legible than scaled characters.

Superscript/Superior [SUPS]
 
picto Subscript/Inferior [SINF]

Substitutes all figures with their inferiors letterforms, commonly used for chemical compounds, and as mathematical exponents. These designed glyphs match the weight of the regular letters and numbers, they are spaced more generously and therefore are more legible than scaled characters.

Subscript/Inferior [SINF]
 
picto Stylistic Alternates [SALT]
picto2 Stylistic Set 1 [SS01]

This feature will activate some alternative glyphs which can be activated by turning on ‘Stylistic Alternates’ in Adobe Illustrator and Photoshop, or on the other hand by selecting ‘Stylistic Set 1’ in InDesign.

Stylistic Alternates [SALT]
 
picto Stylistic Set 02 [SS02]

This feature will activate a wider version of the letters ‘m’ and ‘w’ by turning on the ‘Stylistic Set 2’ in InDesign.

Stylistic Set 02 [SS02]
 
picto Contextual Alternates [CALT]

This feature substitutes a glyph or a combination of glyphs that only occur depending on what letters are nearby. For instance the letter ‘x’ placed 
after a number will be replaced by the ‘multiplication’ glyph. 

Contextual Alternates [CALT]