This is a grammar term that pseudo-intellectuals claim needs to be adhered to in all circumstances. Yet, there are a multitude of circumstances in which the passive voice would be clearer to the listen/reader and would make more sense to use.
active voice: Jon stabbed Alan.
passive voice: Alan was stabbed by Jon.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug