The latest Raspberry Pi models have WiFi chips built in that allow the device to connect to a wireless network. If you are connected to WiFi on your Raspberry Pi, but experiencing poor speed or dropped connections, it is time to check the WiFi signal strength to begin troubleshooting the issue. Generally, the little WiFi chip built into Raspberry Pi 4, Raspberry Pi 3, or Raspberry Pi Zero W models is about as strong as the one you would find in your mobile phone, but checking the signal strength will tell you if you are close enough to the router or hotspot.
Despite its extremely small size, a newer generation Raspberry Pi comes with a built in WiFi chip that allows it to connect to wireless networks. Those with a Raspberry Pi 4, Raspberry Pi 3, or Raspberry Pi Zero W no longer need to rely exclusively on Ethernet connections to enable access to a local network or the internet. In case you are not sure which Raspberry Pi you have, check our tutorial on how to check Raspberry Pi model. Although connecting via Ethernet is straightforward, connecting to a WiFi network will require a few more steps.
Rfkill is an utility available in the vast majority of Linux distributions, and often installed by default. The utility allows us to list, enable or disable various types of wireless interfaces like WIFI or Bluetooth on Linux.