I've seen it used in two ways to talk about software... 1. - Horizontal = broad - vertical = niche 2. - horizontal = notion solving a specific problem and

I've seen it used in two ways to talk about software... 1. - Horizontal = broad - vertical = niche 2. - horizontal = notion solving a specific problem and solving others via integration with other products - vertical = a company like microsoft that solves a range of problems through directly integrated 1st party products.