Why is UFW disabled by default?

[kalpana]

My home network has built in firewall and other security services, so I'm not as concerned with individual computers and firewalls at home.

However, I was traveling this past week and was on other networks. Checked firewall settings, and by default it is off. Easy enough to enable firewall, and was good to go for travels.

Why is UFW disabled? Is there other security functions and/or firewall functions active by default? Are there security functions at the kernel level, so no need for firewall or UFW?

Curious about the basic security of a default Ubuntu install, thanks
Ubuntu 22.04 | Toshiba Satellite C655 | i3 2.3Ghz | Intel HD Graphics 3000 | 8GB RAM | 65GB SSD
Fedora 38 | Lenovo Edge 15 | i5 1.7Ghz | Intel HD Graphics 4400 | 6GB RAM | 1TB HDD