This book looks at the basics of computer safety. It emphasises that once a computer is online, the user is open to dangers of various kinds, so there is a need to keep information private and use secure passwords. It defines digital footprints and online identity, and explains how to tell if a website is safe to visit. It also explains about computer etiquette and cyber bullying. The concepts are illustrated with case studies and examples of searches, and there are do's and don'ts and fact boxes to illustrate the topics covered. Part of the Understanding Computing series.