Passive voice is a grammatical construction where the subject of the sentence receives the action of the verb, rather than performing the action. In passive voice, the focus is on the action or the recipient of the action, rather than on who or what is performing the action.
Example in passive voice: The cake was baked by her.
Here, the subject (the cake) is receiving the action (baked), and the doer (her) is mentioned later in the sentence, often with the preposition "by."