For every position for which you apply, there are countless other unqualified,
somewhat qualified, and extremely well qualified competitors.
A well-crafted "cover letter" will give you an edge over competition.
A great cover letter can be a powerful marketing tool that does all of the following:
Positions you above the competition
Sells your qualifications and career/life successes
Demonstrates your knowledge, experience, and expertise
Creates excitement, enthusiasm, and
thus: an interview
This gig is also ideal for general letters to approach companies or recruiters for a position without a specific job posting, Company promotional letters, Referral letters, Recommendation letters and Thank you notes.