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A JAR file may contain a variety of files including .class, image, sound, HTML pages
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The JAR file is stored in compressed (zip) fashion and can also be signed using standard digital signature techniques.
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Perhaps they download faster due to compression!
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There is a "control" file called a manifest which is used to identify any JavaBean present. It also specifies a message digest algorithm.
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JavaBeans must be stored in JAR files and must be identified in a manifest.
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JAR files can be accessed from HTML using <APPLET> tag
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<APPLET ARCHIVES="first.jar,second.jar" CODE="yourclass.class" WIDTH=100 HEIGHT=200 ></APPLET>
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Java looks first in .jar files for requested class
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