What’s the Purpose of Corporate Development?

Do you sometimes sit back after a long week at work and ask, “what’s the point of my particular tech job?” Not, “why am I doing this?” but actually, “what’s the purpose of my specific job junction?

For some, it is apparent and straightforward — their job is selling a product or service, writing new code, or bringing a new product to market. What’s the purpose of Corporate Development or “Corp Dev,” in technology settings? that particular function at a company that is described as helping one company buy another company?