Bloomberg, as you are likely referring to it, is a financial data source used by many finance professionals. It provides real-time pricing data on equity, debt and other securities. Additionally, it provides fundamental data on each of the above. It is fairly expensive, often costing $1,500-$2,000 per month, per seat.
A major global provider of 24-hour financial news and information including real-time and historic price data, financials data, trading news and analyst coverage, as well as general news and sports. Its services, which span their own platform, television, radio and magazines, offer professionals analytic tools.
Investopedia Says: One of its key revenue earners and what they are well known for is the Bloomberg Terminal - an integrated platform that streams together price data, financials, news, trading data, and much more to more than 250,000 customers worldwide.