Downloading a JAR installer is the first step toward running Java-based applications, which can range from productivity tools to games like Minecraft. A JAR (Java Archive) file is a package format that aggregates multiple Java class files and metadata into a single compressed file for efficient distribution. How to Download and Set Up a JAR Installer
To use a JAR file as an installer, your system must have the or Java Development Kit (JDK) installed to "read" the package. How to run a Jar file - TheServerSide download jar installer