How To Check Whether CheckBox Is Checked/Selected/Ticketed Or Not in LWC

If you want to check this functionality we can relay on the event object of the java script which will tells you whether check box is selected or not.
checkboxSelection.html

<template>
 <lightning-input type="checkbox" label="" onchange={selectDeselectAll}>
    </lightning-input>
</template>

checkboxSelection.js

import { LightningElement} from 'lwc';
export default class CheckBoxClassDet extends LightningElement
{
    
 selectDeselectAll(event) {
        if (event.target.checked)
  {
    console.log('Check box is checked');
  }
  else
  {
    console.log('check box is unchecked');
  }
}

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Hope this helps you..Enjoy..!