For a company with a big portfolio, it's important to assess its product lines regularly to see which product is profitable, which is making losses, and which ones need some work. This practice helps the company to allocate its resources accordingly in order to function more efficiently. While there are many practices and tools available to the company to accomplish this mission, the BCG matrix, developed by the Boston Consulting Group, is considered to be a gold standard to analyse and assess which product is profitable, which is declining, and which need additional budget or support. Explain what is BCG matrix and the elements involved. Support your answer with examples