Contains the Java collections framework, some Java internationalization support Java classes, a Java service loader, Java properties, Java random number generation, Java string parsing and Java scanning Java classes, Java base64 encoding and Java base 64 decoding, a Java bit array, and several miscellaneous Java utility classes.

https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/package-summary.html