Creating a perfect Amazon listing starts with keyword research. The Amazon A9 search engine differs from others such as Bing and Google in one crucial respect. They are geared towards helping people find information.
Amazon is focused on helping people find things to buy. What would someone type into Amazon when they want to find your product? We use multiple sources to refine an Amazon-specific list to cover all the bases.
The highest-ranking keywords will go into the title, using as many of the characters that Amazon allows us at the time. (The length varies by category, and the rules often change. This is something we keep an eye on all the time).