Why do computers have firewalls and mobile devices (phones, tablets) do not?

why-do-computers-have-firewalls-and-mobile-devices-(phones,-tablets)-do-not?

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I've yet to find a good answer on this topic. I'm not a cybersecurity expert by any means, but have recently studied the importance of firewalls and am still unsure why mobile devices do not have an actual firewall. On computers with Windows and Mac OS, there is a built in firewall. However, more people are using mobile devices nowadays over computers, so it doesn't completely make sense why firewalls aren't discussed when it comes to phones and tablets. Right now, my understanding is that the operating systems on mobile devices have enough protection that a firewall is not needed. I'm curious on what others have to say about this topic?

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