ITIL Security Management means keeping your data safe from people who don't have permission to see it. It is like locking the front door of your house and only giving keys to friends and family that you trust. ITIL Security Management helps to make sure that only people with permission can access data and information. It does this by having rules and systems in place that track who has access to data and information and monitors who is trying to access it. This helps to keep your data safe from hackers and other people that you don't want to see it.