It is worth it or It is worth
Why is 'it' necessary at the end of the sentence? What's the difference between them?
Are both of them correct?

If anyone can tell me the difference and which one is corret, I would be glad!
Thanks a lot for your help in advance and I wish you a great week!

Hyunwook

Question

It is worth it or It is worth
Why is 'it' necessary at the end of the sentence? What's the difference between them?
Are both of them correct?

If anyone can tell me the difference and which one is corret, I would be glad! 
Thanks a lot for your help in advance and I wish you a great week!

Hyunwook

Answer

As a sentence only 'it is worth it' is correct. 'It is worth' could be used as part of a sentence, such as 'I don't know what it is worth', or 'it is worth $10, but I got it for $2'.