Engineering has many, many branches. Some of them are Mechanical, Civil, Chemical, Nuclear, Electrical, Electronic, Manufacturing (also called Process or Processing), Agricultural, Diesel, Materials, Metallurgical. A very long list. I started out civil, public works and ended up materials. Then, the Feds, States, Counties and pretty much everybody else decided infrastructure wasn’t important anymore in the late 1990s and fired their engineering staffs. Roads, power, water, sewer, you name it. You can guess what happened. Oregon has had to rebuild most of its bridge system in the last 2 years. For two reasons- increased axle loads on trucks and a lack of infrastructure spending for almost 20 years.