What does "cannot find Symbol" mean in a Java project in IntelliJ?

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"Cannot find symbol" is a compilation error in Java that occurs when the compiler cannot find the definition of a class, method, variable, or other symbol referenced in the code. This can happen if the name of the symbol is misspelled or if it has not been imported or declared correctly. It can also happen if there is a problem with the classpath, which is a list of directories and JAR files that the compiler uses to find the classes it needs.