can users save forms

If I have a long form, is there a way for user to save the form and come back to it later?  

Also, if the form needs to be filled out by more than one person, is there a way for one user to save the form and then send a URL to another user for them to fill in more data?

You can enable the autofill feature in your form: https://www.jotform.com/help/227-How-to-Enable-Auto-Fill-Feature

So the user can continue with the form later, please note that this feature saves the data into the local browser storage of the user so it's required to continue using the same computer and browser.

On regards of someone else completing the form, you can accomplish it by following this workaround: https://www.jotform.com/features/save-and-continue/

Let us know if you need more help, we will be glad to assist you.