A more thorough explanation:

Definition: Treachery is when someone intentionally breaks a trust or confidence that has been placed in them.

Examples:

• A soldier who gives away the location of their own troops to the enemy is committing an act of treachery.
• A friend who shares personal information that was shared in confidence is also guilty of treachery.
• A politician who promises to do one thing but then does the opposite is also committing an act of treachery.

These examples illustrate how treachery involves intentionally betraying someone's trust or confidence. It can happen in many different contexts, from personal relationships to professional settings.