Texter lets you define text substitution hotstrings that, when triggered, will replace hotstring with a larger piece of text.
By entering your most commonly-typed snippets of text into Texter, you can save countless keystrokes in the course of the day.
One common use example given for applications like Texter is email signatures. For example, you could define a series of hotstrings that would be replaced by different signatures. So something like sig1 will automatically be replaced by your full signature when triggered.