A worker is someone who does a job or task, especially one that involves physical or mental effort to produce something or provide a service. Workers build houses, teach classes, fix cars, write code, grow food, care for patients, and perform countless other jobs that keep society running. A construction worker operates heavy machinery, an office worker analyzes data, and a farm worker harvests crops.

The word emphasizes the doing part of work: the actual effort and activity involved in a job. When people talk about “American workers” or “factory workers,” they're referring to the millions of people who show up every day to earn their living through their labor and skills.

In nature, worker bees and worker ants are colony members who gather food, build the nest, and care for the young while the queen focuses on laying eggs. These insects earned the name because they're constantly busy with tasks that keep their colony alive.

The term can sometimes suggest hard physical labor, but workers exist at every level and in every field. A scientist is a worker in a laboratory, just as a cashier is a worker in a store. What makes someone a worker isn't the type of job but the fact that they're actively engaged in productive effort. When someone calls themselves a “hard worker,” they're saying they put genuine effort and dedication into whatever they do.