Repetitive typing of the same text, especially in chat or e-mail replies at times can get time-consuming and also boring. AutoHotkey allows writing scripts for auto-completion of text modules. For example,

: :sig: :With kind regards{Enter}{ Enter} Yours sincerely{Enter}{Enter} Samir Makwana{Enter}Writer-
DIGIT{ Enter} 9.9
Interactive{ Enter} Mumbai
{ Enter}

Name: Run with Hot Strings.jpg Views: 58 Size: 35.3 KB

Save and run this script. Now whenever you type "sig", you'll find your signature pasted automatically. Make sure that the trigger ("sig" in our case) is unique, or you'll find yourself inserting signatures where they shouldn't be. It's better to use special characters, such as @@ to avoid any confusion.
Another example: This hotkey will add the text above as soon as you have typed