There are three main types of wireframe: low-fidelity, mid-fidelity, and high-fidelity.
Low-fidelity wireframes are your rough early designs—they tend to contain very little content and be in greyscale.
Mid-fidelity wireframes are still a little rough around the edges, but they contain more elements and are closer to what you envision your final solution to look like.
High-fidelity wireframes are the highest quality version of wireframes. They’ll help you validate your design decisions with users while also testing for usability issues.