When you are choosing the font or typeface for a project, there are a number of considerations to be made, before you can finalize your selection.
Leading – This denotes the vertical space between every line of your content. This gap has to be sufficient enough to make the content look legible, at the same time the gap should not be too much. Too much of a gap will only occupy space and look like a space filler.
Kerning – Sometimes the space between characters need to be adjusted to make it look appealing visually. Some of the letters tend to touch or look too close to each other, thereby making the content look cluttered or unreadable. Here, the content has to be kerned to make it legible.