You can think of a cover letter as essentially the "summary" of your resume. A cover letter will introduce you, and highlight some of your skill sets. It provides additional information to your potential employer that you may not have had time or space to elaborate on in your resume. Essentially, when employers are looking through different applications, they will read your cover letter to "screen" potential candidates that they take an interest in.
When writing a cover letter, the most important thing to highlight is WHY you are qualified for the job, and why your skills can greatly benefit the company/agency.
The cover letter should include your name, address, and contact information. If you know who is reading the letter (for example, the boss' name) you should start with "Dear Mr/Mrs. ____". If you are not aware of who will be reading the letter, you should start with "To whom it may concern". The body of the cover letter should highlight your skill sets and qualifications. After that, sign it with "Thank you for your time and consideration, (your name)
*Try to keep your cover letter short in length, but effective. You want the employer to be able to glance at it quickly, but get to know you as well.
I hope this helped, and I hope you get the job! Good luck, and if you have anymore questions feel free to contact me!
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