Technical term in computing and typography for the horizontal space between characters.
Adjust the character spacing to make the layout easier to read.
字間 is a more common, everyday term for character spacing, while 文字間隔 is more technical and explicit.
行間 refers to line spacing, whereas 文字間隔 refers to spacing between individual characters.
Compound of 文字 (character) and 間隔 (interval, spacing).