If you were given a large data set such as the sales over the last year of our top 1,000 customers, what might you be able to do with this data? what might be the benefits of describing the data?

Thank you for posting your question here. Segment this data into meaningful chunks to help your marketing and selling activity. From this data you can create a profile of what your most active customer buys and how often, identify those who only buy in cycles (or just for specific products), identify those who have stopped buying from you (lapsed customers), create an demand forecast for future products from the trend shown.