I cannot quite understand what we need maven for and what dependency is. Could

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Editorial Team

Asked: June 4, 20262026-06-04T08:07:54+00:00 2026-06-04T08:07:54+00:00

I cannot quite understand what we need maven for and what dependency is. Could

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I cannot quite understand what we need maven for and what dependency is.

Could anyone explain in simple words what means? Where does it look for them?
When writing:

<dependency>
  <groupId>org.eclipse.persistence</groupId>
  <artifactId>eclipselink</artifactId>
  <version>2.0.0</version>
</dependency>

It tells:

Missing artifact org.eclipse.persistence:eclipselink:jar:2.0.0

What does it mean?

I have 2 versions of maven installed on my system – one for the cmd, the second one as a plugin for eclipse. What is the difference? Which way is it more common to use Maven – from the cmd or from eclipse?
And I read somewhere that maven needs connection to the internet – what is that for?