Rekern

Illustrator tends to treat a line of text as an object, so changing a word at the end of a line can often result in a great deal of hand-manipulation to rekern the type or move a word onto the next line.

Source: wiktionary

Here the original drawing is shown in grey and the infilled tracing in black. The lettering can be further refined and, unlike ink-based artwork, can be rekerned without being redrawn.

Source: wiktionary