Java VisualVM (VisualVM) is a powerful, visual tool included with the Java Development Kit (JDK) that provides a comprehensive set of monitoring, troubleshooting, and profiling capabilities for Java applications running on the Java Virtual Machine (JVM). VisualVM is designed to help developers and administrators analyze the performance and behavior of Java applications to identify issues, optimize performance, and diagnose problems.

Here are some key features and capabilities of Java VisualVM:

1. Real-time Monitoring: VisualVM allows you to monitor the runtime behavior of Java applications in real-time. You can view CPU usage, memory usage, thread activity, and more.

2. Heap Dump and Memory Analysis: You can take heap dumps of running Java applications and analyze them to identify memory leaks, excessive object creation, and memory usage patterns. VisualVM provides powerful tools for visualizing heap dumps and analyzing object instances and references.

3. Thread Analysis: VisualVM provides thread monitoring and analysis tools to help you identify thread-related issues such as deadlocks, contention, and excessive thread creation.

4. Profiling: You can profile Java applications to gather information about method execution times, CPU usage, memory allocation, and more. VisualVM supports various profiling modes, including CPU profiling, memory profiling, and custom profiling.

5. Visual Profiler: The VisualVM Profiler offers a visual representation of profiling data, making it easier to identify performance bottlenecks and areas for optimization in your Java code.

6. JMX Integration: VisualVM can connect to Java applications that expose management and monitoring information through Java Management Extensions (JMX). This allows you to inspect and manage MBeans (Managed Beans) in your application.

7. Remote Monitoring: You can monitor and profile Java applications running on remote servers by connecting VisualVM to remote JVMs using JMX or other remote monitoring options.

8. Plugins and Extensions: VisualVM supports plugins and extensions, allowing you to add additional functionality and customizations to the tool.

9. Integration with Other Tools: VisualVM can be integrated with other profiling and monitoring tools, such as the Java Flight Recorder (JFR) and Mission Control, for more advanced analysis and troubleshooting.

10. Open Source: VisualVM is an open-source tool and is part of the Oracle JDK. It is also compatible with other JDK distributions like OpenJDK.