terrorists are a group of people who are acting on behalf of jihadist groups
There are a lot of terrorist groups out there and only some of them are Jihadists. There are secular groups out there, such as the FARC and the ELN of Colombia. Then there are Catholic based groups, such as the Real IRA of Ireland and the ETA of Basque/Spain. There are also Baptist and Presbyterian terrorist groups, such as the NSCN and NLFT of India.