Can anyone see me if I use VPN?

I've been considering using a VPN for my online activities, but I'm concerned about privacy. Can anyone see me or track my activities if I use a VPN? It's important for me to ensure that my personal information is secure and protected, so I'm looking for a reliable solution that can provide me with the anonymity and security I need. Can you explain how VPNs work and how effective they are at hiding my identity and preventing others from accessing my data?