Is the POJO class an object?

I don't quite understand why a POJO object is so convenient and how to understand that it is a POJO.

By definition, this is an object that does not extend anything, does not implement anything, and does not have a constructor, all variables are private + getters and setters... Just such a simple object.

So, if I understand correctly, if we let's throw out a constructor from this class, then it's like POJO already?

public final class CardFriend {

private String friendName;
private String friendPhoneNumber;
private Bitmap friendPhotoBitmap;
private String friendEmail;
private String Uid;
private int chanel;

public CardFriend(String friendName, String friendPhoneNumber, Bitmap photoBitmap, String friendEmail,
                  int chanel) {
    this.friendPhotoBitmap = photoBitmap;
    this.Uid = "test";

    if (friendName == null){
        this.friendName = States.NO_NAME;
    }else {
        this.friendName = friendName;
    }

    if (friendPhoneNumber == null){
        this.friendPhoneNumber = States.WITHOUT_PHONE_NUMBER;
    }else {
        this.friendPhoneNumber = friendPhoneNumber;
    }

    if (friendEmail == null) {
        this.friendEmail = States.WITHOUT_EMAIL;
    } else {
        this.friendEmail = friendEmail;
    }

    this.chanel = chanel;
}

public String getFriendName() {
    return friendName;
}

public String getFriendPhoneNumber() {
    return friendPhoneNumber;
}

public Bitmap getFriendPhotoBitmap() {
    return friendPhotoBitmap;
}

public String getFriendEmail() {
    return friendEmail;
}

public int getChanel() {
    return chanel;
}

public String getUid() {
    return Uid;
}
}

And I have not found whether it is possible to use logical methods in such cases. classes? Let's assume the method of some calculation.

Well, if someone gives examples where such objects are best used (since it is not a dubious advantage to throw out the constructor and put setters), it will be quite clear))