java.time.LocalDateTime is a class in the Java programming language that represents a date and time without a time zone. It is part of the java.time package, introduced in Java 8, and is designed to handle date and time in a more intuitive way compared to older classes like java.util.Date. This class allows developers to create, manipulate, and format date-time values easily. It provides methods for adding or subtracting time, comparing dates, and converting to other date-time types. LocalDateTime is particularly useful for applications that require precise date and time handling without the complexities of time zones.