Engineering to an outside observer may just seem like one giant profession of people who like math. The reality of the matter is though that within engineering there’s a massive breadth of disciplines that are about as different as astronomers and astrologists.
For example, civil engineers might design bridges or a wastewater treatment system for a large municipality; while electrical engineers might design electricity transmission towers or circuits for a small robotics firm. All the while, each has little ability to do what the other does (unless, of course, they studied that field of engineering too).