This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The first one is the HTTP Connector which implements HTTP protocol and used for servicing client requests.
The second one is AJP Connector element which is used for communicating with a web connector via the AJP i.e Apache Java Protocol. You can use this when you want to integrate Tomcat into an Apache installation so that Apache handles the static content contained in the web application and also may be for utilizing Apache's SSL processing.