Testimonials or customer reviews add content to your site which makes your site more believable for those who are visiting for the first time. Reviews and ratings add value to your site and show that you are an authentic supplier of the service you are selling.
Testimonials are an important part of the online business and greatly helps in increasing the conversion rate of the business.
Testimonials make them comfortable to purchase if they know other people have also purchased the same thing and are happy with that.
In fact, big e-commerce companies like Amazon, EBay, or Flipkart are based around customer reviews.
This is how testimonials can be helpful for your business.