Here's the main idea:
According to the Interaction Design Foundation, here's what you'll leave with "...a number of inexpensive, scaled down versions of the product or specific features found within the product." Designers can test this scaled-down version of the product to see if they can solve the problems in the last ideate step.
Author/Copyright holder: Teo Yu Siang and Interaction Design Foundation. Copyright licence: CC BY-NC-SA 3.0
What tools can I use for this?
Any number of industry standard design tools can be used (these tools are always evolving and changing). For example, in early 2021, the main tools being used are Sketch and Figma, but this depends on what your team is used to.