You need to consist of a resume cover letter, unless the task ad demonstrably claims not to ever.
The goal of a resume cover letter
Whenever composing a employment cover letter, you ought to:
- introduce yourself
- mention the task (or form of task) you are trying to get (or trying to find)
- show that your particular abilities and experience match the abilities and experience had a need to perform the job
- enable the audience to read through your application
- finish with a proactive approach (for instance, requesting an meeting or a gathering).