A subscriber is someone who signs up to receive something regularly, usually by paying a fee or providing their contact information. When you subscribe to a magazine, you become a subscriber who gets new issues delivered to your home each month. When your parents subscribe to a streaming service like Netflix or Disney+, they're subscribers who can watch shows and movies as long as they keep paying.

Today, you can be a subscriber to all kinds of things: YouTube channels (where subscribing is free and just means you'll see new videos), newspapers, podcasts, or even monthly boxes of snacks or books.

Being a subscriber usually means you're part of an ongoing relationship, not just making a one-time purchase. A subscriber to a science magazine gets twelve issues throughout the year, while someone who buys a single issue at the store isn't a subscriber. Companies often value their subscribers because they represent steady, reliable support, like a YouTuber who knows their subscribers will watch new videos each week.