JDK (Java Development Kit) is a software development kit for Java programming language, provided by Oracle Corporation. It includes a Java Runtime Environment (JRE), development tools like the Java compiler and debugger, and additional libraries and tools for developing Java applications.

To set the JDK path in Windows:

1. 1. Download and install the JDK from the Oracle website.

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3. 2. Right-click on "My Computer" and select "Properties".

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5. 3. In the System Properties, click on the "Advanced" tab and then click on the "Environment Variables" button.

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7. 4. In the Environment Variables window, scroll down to the "System Variables" section and look for "JAVA_HOME". If it doesn't exist, click on the "New" button and add a new variable with the name "JAVA_HOME" and the value of the JDK installation directory (e.g. "C:\Program Files\Java\jdk1.8.0_251").

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9. 5. Scroll down to the "Path" variable, click on "Edit", and add the JDK bin folder to the end of the value (e.g. ";C:\Program Files\Java\jdk1.8.0_251\bin").

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11. 6. Click on "OK" to close all windows.

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13. 7. To check if the JDK path is set correctly, open a Command Prompt window and type "java -version". It should display the version of the JDK installed on your system.

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Note: The steps may vary slightly based on the version of Windows you are using.