A fulfillment service is a company that stores, packs, and ships your products for you. They manage your inventory and take care of all the logistics involved in getting your products to your customers, so you can focus on running your business.
There are many different fulfillment services out there, and the one you choose will depend on your specific needs. Some factors you may want to consider include:
-How many products do you have?
-What are the dimensions and weights of your products?
-Do you need help with branding or packaging?
-Do you ship internationally?
-What are your shipping rates?
You can find a more detailed list of questions to ask here: https://www.entrepreneur.com/article/290074