The purpose of creating a Scopus profile is to help disambiguate authors with similar names and/or similar research areas, and to help track where and if your work has been cited. Creating a profile is free, although you have to register. You will need to remember to update it from time to time.
Persons with common surnames (Johnson and Smith are common in the United States, Li, Zhang and Chen are most common in authors from China, according to http://www.mandarinhouse.com/100-common-chinese-family-names) may wish to create a profile and put the references to their works in the reference lists.
ORCID is another type of identification code for researchers. They are not mutually exclusive; in fact, if you have a Scopus profile it makes it even easier to make and populate an ORCID profile, and vice versa. ORCID is developed by a nonprofit group supported by various academic institutions and publishers.