Mac automatically turns ON without touching.

Prevent a Mac laptop from turning on when opening its lid or connecting to power - Apple Support

Prevent a Mac laptop from turning on when opening its lid or connecting to power

A Mac laptop with Apple silicon automatically turns on and starts up when you open its lid or connect it to power. With macOS Sequoia 15 or later, you can change this behavior without affecting your ability to use your keyboard or trackpad to turn on your Mac.

1. Make sure that your Mac laptop with Apple silicon is using macOS Sequoia or later.
2. Open the Terminal app, which is in the Utilities folder of your Applications folder.
3. Type one of these commands in Terminal, then press Return:

• • To prevent startup when opening the lid or connecting to power: sudo nvram BootPreference=%00
  • To prevent startup only when opening the lid: sudo nvram BootPreference=%01
  • To prevent startup only when connecting to power: sudo nvram BootPreference=%02

1. Type your administrator password when prompted (Terminal doesn’t show the password as it's typed), then press Return.

To undo any of the previous commands and reenable automatic startup when opening the lid or connecting to power, enter  sudo nvram -d BootPreference in Terminal.

“Mac automatically turns ON without touching. After the new update I am facing a weird problem in Mac Air M1. After shutting down the Mac its automatically turns ON without touching it or opening the lid. I have checked Keyboard and trackpad both are fine.”

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Mac Turning On By Itself:

Is the screen closed (in Clamshell

Mode) and this is occurring? If so, and you have something keeping it open (ie a iSight Camera cover or a keyboard cover), then it can stay on, due to opening. So, if such is the case, you should remove this hardware. And a bit of a tip for privacy, when it comes to the iSight Camera: Use my User Tip: How to Use a Profile to Disable the iSight Camera - Apple Community

Do you have any peripherals attached to the MacBook Air?

Which update did you install?