.rar is a proprietary archive file format that supports data compression, error recovery, and file spanning. Both proprietary and free programs are available for accessing such files. A tutorial on accessing .rar files, including a free extractor, is available {multi-excerpt-include:wikicontent:Exit Disclaimer to Include|name=ExitDisclaimer|nopanel=true} | .
.war files (short for Web application Archive) are Java archive files used for packaging and distribution of Web applications. .war files often contain a collection of JavaServer Pages, Java Servlets, Java classes, XML files, tag libraries, and static Web pages (HTML and related files). More information can be found in the Wikipedia article
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Background information on Java Web applications is available {multi-excerpt-include:wikicontent:Exit Disclaimer to Include|name=ExitDisclaimer|nopanel=true} | . |