You wouldn't trust just anyone to have access to your network, would you?
I would imagine you wouldn't leave your front door unlocked while you're out of the house.
Likely you've answered no.
Firewalls and VPNs restrict access to your network and your assets so only those users who you want to let in can get in. Firewalls act as the fence that surrounds your network. Make your network impenetrable and virtually impossible to get it in. VPNs allow your users to access your data and applications through a secure interface. Beef it up with secure access solutions - and really make it tough for someone on the outside to get in.
It only takes 1 security breach to make the news.