Optional.ifPresent() executes a given action if a value is present in the Optional.Optional.orElse() returns the value contained in the Optional, or a default value if the Optional is empty.ifPresent() is used for side effects when the value exists, while orElse() is used to provide a fallback/default value.Combining both, you can log the value if present using ifPresent(), and get the value or a default value using orElse().