The old boy network is a group of people with shared experiences or interests who support and look out for each other. They might have known each other since they were young, and they look out for each other when they need help. Think of it like a club. It usually happens in business, but it's not limited to that – it could be in any group of people. For example, someone might be part of a rock climbing old boy network, where they help each other get discounted gear or advice. In business, it might mean that someone gets help getting a job they wouldn't have got otherwise. Generally, it's not a bad thing, it just means that people help out the ones they know and trust.