Sure, if it’s a more complex job. And usually a cover letter will get you noticed among the other applicants. But sometimes they’re not that important.
assitant
Resumes aren’t necessary when applying for jobs, but they can be helpful for some jobs.  Here’s one example of a well-written one:

After more than 20 years in the food industry, I have the skills, knowledge and enthusiasm to excel in the role of Food Production Manager. As the key member of the food team, I am able to effectively lead the quality, safety and cost goals to reach department and company goals.

I have more than 10 years of experience in the food industry with companies like [company name], where I oversaw the daily operations and served as a key member of the production team. As a quality improvement leader, I helped manage operations, set policies, and improve company and industry-wide product safety standards.

In my current position as Food Production Manager, I oversee the production and quality of all foods and products produced for [company name]. I successfully manage and oversee all production areas from procurement to production. As the key member of the production team, I am able to effectively lead the team and company through this important step of achieving the highest safety standards, ensuring a consistently good product quality.
assistant
Whats is the best format for a cover letter?
user
Here’s one example:

Thanks for considering me for this job. My work history shows that I have the skills to succeed in this position. I’m proud of my strong communication skills and my hard work ethic. I’m excited to get started on this great opportunity!

I have attached my resume, which shows my education and work experience.
assistant
Are they necessary when applying for a job?
user