It's basically the science on how to run a business or industry including the financial, personnel and logistical parts of a business.
Managing a company would be a career option in this field.
Career after completing electronics and instrumentation engineering
If you want to have a successful, promising position in a career in engineering you will want to obtain a degree. You can research local colleges and speak with counselors there and explore the many options in engineering.
MS
An Industrial & Operations Engineer has a variety of career options. Industrial & Operations Engineering is often referred to as "Business" Engineering. An Industrial & Operations Engineer can go into Manufacturing, Logistics, Safety Management, Information Technology, Finance, Business, Urban Planning, Consulting and much more. The purpose of an Industrial & Operations Engineer is to make a process "more efficient". Take for example, the assembly line. The creation of this business process is at the heart of not only business & finance, but Industrial Operations Engineering. Industrial Operations are often found in manufacturing plants where they analyze the business process. They may analyze the work flow of the machines and people that make a product. Or they may look at ways to cut beuracracy and costs. Industrial & Operations Engineers use simulation software programs to help them determine the number of workers needed based on time/work studies. They also conduct one-on-one and group interviews with factory workers. Many Engineers have also focused on Information Technology. They create computer programs that will help improve the efficiency of a business process. The software options are virtually unlimited. This type of engineering requires an extensive math, science, and business background.
There are many career options after database administrator training. Some examples are Information Technology Specialist, Data Analyst, Data Technician, Database Administrator, SQL Programmer and Enterprise Architect.
In India engineering itself has many good job options--couple it with an MBA and you fare even better.
After completing a PhD, opportunities for career advancement include becoming a professor, researcher, consultant, or executive in a company. Other options may include working in government, non-profit organizations, or starting your own business.
There is not a right type of engineering career per say. The engineering career chosen would depend on the individuals desires, such as, pay, future employment, desired state of employment, type of engineering interested in, and how much schooling the person is willing to put up with. Many schools offer the different options they have for such careers within a brochure or website page.
After completing your Bachelor of Computer Applications (BCA), you have several options for further education and career paths. You can MCA or MBA
If one wants to pursue a systems engineer career, it's important to have a background in either automotive engineering, mechanical engineering, industrial engineering, computer engineering, or electrical engineering. It's usually seen as an extension of regular engineering courses.
One can find a job and start an indutstrial engineer career on websites like Career Corner Stone, Indeed, Engineering Jobs, Oregon State Jobs or Princeton Jobs.
I'm from Alberta, Canada, and have many classmates who are currently finishing up their Environmental Engineering degree after completeing degrees within other programs. I don't see why a University or College would not allow you to take environmental engineering after completing an undergrad in environmental science. Provided your academics is sufficient for acceptance into the program.