Create a wireless hotspot
You can use your computer as a wireless hotspot. This allows other devices to connect to you without a separate network, and allows you to share an internet connection you've made with another interface, such as to a wired network or over the cellular network.
Click the icon at the very right of the menu bar and select System Settings.
Open Network and select Wireless on the left.
Click the Use as Hotspot button.
If you are already connected to a wireless network, you will be asked if you want to disconnect from that network. A single wireless adapter can only connect to or create one network at a time. Click Create Hotspot to confirm.
A network name (SSID) and security key are automatically generated. The network name will be based on the name of your computer. Other devices will need this information to connect to the hotspot you've just created.