Overseas, in order to obtain the corresponding qualifications, each professional must go through certain professional knowledge learning and skill training, and then pass the tests given by relevant agencies.  This qualification is usually divided into two categories: license and certificate.  A license is a government permit for the occupation that someone does, and people like doctors, physical therapists, and sports protection personnel must have it while doing their jobs.  A certificate is something to prove that the person has gone through studying and training, and usually personal trainers and fitness coaches have this.  A certificate is not a work permit, and the differences between the two lie in the following three aspects.