Employers who are hiring come together to host a job fair, usually in a large building, like a convention center or something similar. Sometimes it's all the same field of work, like health care for example, but it can be various different lines of work. People who are out of work can go to the job fair and apply for a job with the company of their choice. They look over the application and set up a time for an interview. Sometimes they actually do the interviews right then.