A more thorough explanation:

Definition: A drove is a group of animals that are driven together in a herd. It can also refer to a large group of people in motion.

Examples:

• The farmer led his drove of cattle to the market.
• The shepherd gathered his drove of sheep and brought them back to the barn.
• The protesters formed a drove and marched through the streets.
• During rush hour, the commuters make up a drove of people on the subway.

The examples illustrate how a drove can refer to both animals and people. In the first two examples, the term is used to describe a group of animals that are being herded together. In the last two examples, the term is used to describe a large group of people who are moving together in a particular direction.