Submitting a tender is common practice for businesses supplying goods or services to other businesses or the public sector.
At a basic level you expect to quote for a job or write a letter saying why you should be given the business.
More formal tenders often apply to bigger jobs or for supply contracts spread over time. Public sector work in particular has specific tendering processes. This could include your local council or hospital or a central government department.
Even if you don't win the work this time, writing a tender can clarify your aims, strengths and weaknesses and you can learn for next time by asking for feedback on your bid. It raises your profile with the customer and helps you learn about customers' needs.
This guide explains how to identify potential contracts, what to include in your tender and how to write it for the best chance of success.