Include your resume and cover letter in your job application package.
Many companies now use online application systems that do not allow cover letters. You might be able to figure out how to put one in the same document as your resume, but that's not guaranteed, especially since some systems only allow data to be entered in certain fields. In these cases, use the format provided to you to demonstrate your ability to accomplish the task and your passion for the role. If possible, you can try to get someone to send a brief follow-up email outlining some key points about your application.
