What is the best way to describe the relationship between two companies that offer basically the same product or service?

The relationship between two companies offering essentially the same product or service can be described as competitive. They vie for the same target market, often differentiating themselves through branding, pricing, customer service, or unique features. This competition can drive innovation and improvement in their offerings, ultimately benefiting consumers. Depending on the market dynamics, they may also engage in cooperative strategies, such as partnerships or alliances, to enhance their overall market presence.