Discount brokerage houses generally have lower fees than those touted as full-service. They employ brokers who, primarily, are order takers and may, or may not, give investment advice. If you use a discount broker, be sure you are well-informed about stocks and can make your own investment decisions. Online services allow you to buy your own stocks, bonds, and mutual funds for significantly lowered fees, but not without risk. Although research is available, you are making your own investment decisions.
Most online services provide varying levels of research, news and customer service.
You should also become familiar with the online brokerage commission schedule and fees before joining or trading through an online service. Online services have different levels of strengths so, again, be well-informed before using one. However you decide to buy stocks, from a full service broker, discount broker or online service, research each option carefully and make sure it meets your investment needs.