If you have a chat window on your website or are looking to start using live chat, you've probably heard about "proactive chat invitations".
It is just a fancy name to call automated invitations that are set up to show to visitors depending on their behavior. Basically, the app looks at real time analytics (time spend on site...) and sends invitation to visitors who meet some predefined criterias.
It sounds complicated even when I try to explain it in simple words so I will just let you see what it's used for in the presentation.
Don't hesitate to ask in the comments if you have any questions or check out how proactive invitation works in the http://customericare.com app.