Why do I need an ORCiD?
ORCiDs are now mandatory for some funders and publishers; for example, it is a requirement of funding from the Wellcome Trust. 25 publishers, including Wiley and PLOS, have also signed the Open Letter to require ORCiD as a condition for submission.
ORCiD provides a persistent digital identifier that distinguishes you from every other researcher. It is particularly good is you have a common name or may change your name in the future. It is also a data source for Symplectic and will help automate identification of your outputs.