https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

Java JAR (Java Archive) is a file format that aggregates multiple Java class files and associated metadata and resources (such as images, sounds, or configuration files) into a single file for distribution. Java JAR files are typically used for packaging Java applications and libraries. Introduced in Java 1997 with Java 1.1, JAR files simplify the process of distributing Java applications, ensuring that all required files are bundled together for easy deployment and execution.

https://docs.oracle.com/javase/tutorial/deployment/jar/