Not necessarily, but a blog is really the best promotional tool. With that said, you can always use methods such as PPC or advertising to promote a product. This is another popular method to grow in affiliate marketing. For me, the best way to make the most out of  affiliate marketing opportunities is to have a blog. Learn how to start a blog here.

Now click on your blog posting link (Press This by default in WordPress). If you're using WordPress, you should now see two pieces of link code in your posting form, the first one ending with "Associates Build-A-Link >< /a >". Delete through that point. The second part is a link to the product with your Amazon Associate ID built in. Now just write your product review, choose the appropriate categories for it, and hit Publish.
A blog highlights your technical ability and showcases your ability to write blog posts. Your blog can be about different topics than those you write about for your clients. In fact, it should be on a topic that interests you. Visitors will see that you can not only write, but you can also build an online community. A good blog has the potential to earn you many referrals for more clients.[24]

The one thing to be aware of with WordPress Amazon affiliate plugins is that you don’t want to use one that offers link cloaking. This is a method used to protect affiliates from a threat known as affiliate link hijacking. However, Amazon expressly forbids the cloaking of their links, so you’ll want to avoid plugins that do that or always be sure to disable that functionality if they give you the option.

There’s no need to be intimidated by the cons noted above. Every affiliate program comes with them as does any working relationship you enter into with a well-known brand. Think of Amazon like Google: their top priority is keeping customers happy. Without their continued satisfaction, they wouldn’t be in business and you wouldn’t have an affiliate program to take advantage of, so they need to ensure you don’t abuse the terms of use.