Security is how safe something is from being lost, stolen, hurt, or anything else bad. Sometimes security means the system that keeps something safe. You can have high (extra or good) security or low (poor or not much) security. You call for security in some places like stores and someone comes to protect you. A computer may say its security is poor and it needs a program to keep it safe. Safe is an adjective. How something is that is secure. Safety is the noun that comes from the same word. Safety and security are very similar, but safety is often more about one person staying safe, while a group that is kept safe has security. Safety is more often about people not being hurt, and security is buildings or things. Safety is often more against injury and security against theft. Here are examples: The little boy was not safe when he played in the busy road. The ring was not safe lying out on the table. The house's security was low because they left the windows open at night. There was high security at the party when the president was there. He wore a bicycle helmet for safety. The boy felt secure in his daddy's arms. These are some differences I can think of. I hope they help.