The invitation letter
A business visa usually needs an invitation letter from the host company abroad, on letterhead, stating the purpose, dates and who covers costs. The letter should match the dates and details in your application exactly.
Proof of your employment and business
An employment letter from your Indian employer (or business registration if self-employed) confirms your role, salary and that you are travelling for genuine business. Inconsistent job titles between this and the application form are a common, avoidable issue.
A clear, specific cover letter
A short cover letter tying your documents together — who you are, why you are travelling, the dates, and what each attached document proves — helps the officer navigate your file quickly. Clarity reduces questions.