Can you explain the role and content of the pom.xml file in the Maven project management system?

The pom.xml file in Maven is the main configuration file of a project, where its settings and dependencies are described. "POM" stands for Project Object Model.

In pom.xml, the following are specified:

• Project information: groupId, artifactId, version.
• Dependencies: libraries and modules needed for building and running the project.
• Plugins: tools for building, testing, packaging, and other tasks.
• Build settings: compilation parameters, profiles for different environments.

An example of a simple pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                             http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>my-app</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

Thus, pom.xml manages the entire project lifecycle in Maven — from downloading dependencies to building and testing.