There are risks that affect investments generally, for example, overall economic conditions, political stability, changes in interest rates or the availability of credit, all of which can affect market and general business conditions.
There are also risks which may apply more specifically to a particular investment. For example, if a company loses dominance in a key market, is hit by a scandal over defective products or there are concerns about its poor management, its share price may plunge. You can reduce these risks if you spread your money over different investments, e.g. different products like bonds and shares and different economic sectors or regions. Do read the product documentation to understand the different risks, especially for complex products like structured notes or products which are bought using leverage.