Where is maven central repository ?
When you use Maven to build your project, Maven will check your pom.xml file to download all the project dependency libraries.
In this case, If Maven can’t find your dependency libraries in your Maven local repository, it will try download it from the default Maven central repository, which is http://repo1.maven.org/maven2/.
This is how Maven central repository look like :

[...] from the central repository. In Maven, when you need some libraries that are NOT EXITS the Maven center repository, the process will stopped and output error messages to your Maven [...]
[...] Maven central repository Maven central repository is the default location to download all the project dependency libraries. [...]