Some TV manufacturers have experimented with providing web browser apps in the past but, because they're so impractical, I think that they've all given up on the idea these days.
To be able to use browse the web you'd need a mouse and a keyboard (as with a desktop computer), a touchpad and a keyboard (as with a laptop) or a touch-screen device (as with a mobile phone or tablet). None of those options are really practical with a TV set, so that's why you can't really use a web browser with one.
Obviously though, you can still display the output from another device (such as a computer or mobile phone) on your TV's screen by simply using it as a monitor. To do so, you either need a suitable cable to connect between the relevant device and your telly or to stream what's on your mobile phone (etc) to your TV screen, using either a Chromecast device or possibly a built-in app.