What happens when you connect your ipad to the network but when you enter the password it says unable to connect to network

Presumably you are having difficulties connecting to your WiFi network. Start here:

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support

…and here:

Recommended settings for Wi-Fi routers and access points - Apple Support

Assuming that you are using the correct WiFi Password, a restart of your WiFi Router may clear the problem.

To restart your router, disconnect power from the router for at least 30 seconds - then reconnect power to restart. After your router reboots (which may take several minutes), force restart your iPad:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On an iPad with Face ID: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.