Opt-in list is a list of email addresses you keep of people who signed up to receive your updates. An example of this is a "squeeze page", which is a webpage that is used to entice visitors to share their names and email addresses with the website owner. The list of names and email address would be called your email list or opt-in list (because these people opted to receive emails from you).
When you develop future scripts or products, you can send an email to the whole list... and if you are selling something, you can get several conversions overnight.
If you decide to do this, I would research it first, because you want to do it correctly because a) you obviously want to capitalize and not abuse it's power, and b) if not done correctly, you may be crossing the line of spamming.
Hope this clears it up.
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