One of Java's biggest issue is verbosity. Anyone who has ever tried writing a simple hello world program in Java will tell you the number of lines of code that requires. Unlike Java, Kotlin is not a verbose language. Kotlin eliminates a lot boilerplate code such as getters and setters. For example, let's compare a POJO in Java to the same POJO in Kotlin.

Student POJO in Java:

public class Student {
    
    private String name;
    
    private String id;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

Student POJO in Kotlin:

class Student() {
  var name:String
  var id:String
}

As you can see, there's way less Kotlin code for the same functionality.