Everything a company can build is either solution deepening or market widening, and doing one means not doing the other.

Founder and chief executive of Superhuman

you can classify anything that you build in a company into one of two categories. Solution deepening and market widening. Now solution deepening means making your product better for its existing users but not making it available to more users. Whereas market widening means making your product available to more users but not making the product itself any better.