"Manufacturing" isn't an industry. It's an activity that many different industries do, such as the automotive industry, the consumer electronics industry, the pharmaceutical industry, etc.

High level overview of the industry * Biggest players * Problems they solve, problems they face * Size of the industry (jobs, total value etc.)

If you start with a Wikipedia article and start following links and doing followup web searches, you'll find much of this information. For example:

https://en.wikipedia.org/wiki/Automotive_industry

https://en.wikipedia.org/wiki/Pharmaceutical_industry