What is the difference between files with extensions *.var and *.jar in terms of their purpose and usage?

Files with extensions *.jar and *.var have different purposes and are used in different contexts:

• .jar (Java ARchive) — is an archive file containing compiled Java classes, metadata, and resources (such as images, configurations). It is used for packaging Java applications or libraries that can be run or integrated into other projects. A JAR file can be run as a standalone application (if it has a manifest with an entry point).

• .var — is a less common extension that can be used for various purposes depending on the context. In the Java ecosystem, it is not a standard format. Sometimes, files with the .var extension are used to store variables, configurations, or data in certain tools or frameworks, but this is not a standard Java format.

In terms of Java, the main difference is:

• .jar — a standard format for packaging and distributing Java code.
• .var — a non-standard, application-specific format not directly related to Java.

Example of running a JAR file:

java -jar myapp.jar