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This question is about are cover letters necessary.
Employers look for conciseness, professionalism, and personality in a cover letter. The technical details will change based on the job and requirements, but these three elements carry through no matter what content you put in your cover letter.
Hiring managers don't have time to read through multiple pages of fluff about your every accomplishment and professional goal, and some don't even read one full page. They want you to get to the point about what you're trying to say, so make sure your letter is lean and to the point.
As you write, there is no need to be overly stuffy, but you should add a little more polish than you would to an email you'd write to a coworker.
Follow formatting guidelines for formal letters by including the recipient's name and address as well as your own. Maintain a polite tone of voice and proofread your letter, getting someone else to check over it for you if possible.
Within the parameters of professionalism, though, you should let your personality shine through.
Hiring managers want to see what you're passionate about in your work and why they should choose you for the position, so make sure you share how your values and skills line up with the organization's and how you'd use them to help further the company.

Zippia allows you to choose from different easy-to-use templates, and provides you with expert advice. Using the templates, you can rest assured that the structure and format of your resume is top notch. Choose a template with the colors, fonts & text sizes that are appropriate for your industry.