This week's book giveaway is in the Java in General forum. We're giving away four copies of Helidon Revealed: A Practical Guide to Oracle’s Microservices Framework and have Michael Redlich on-line! See this thread for details.
This has to be a huge can of worms. An App server has everything a web server has and more. A typicla web server will serve web pages. Sometimes it will do some dynamic html stuff too. An app server will also run applications and distributed stuff - usually EJB.