Both proposals are based on Orion spacecraft's hardware, and are designed to take astronauts from the Lunar Gateway — a proposed habitat that NASA plans to build in orbit around the Moon — to the lunar surface and advance technology needed to explore Mars.
NASA did not select this design for the Human Landing System component, but Lockheed Martin is providing the ascent portion of the Integrated Lander Vehicle, which was selected as a second HLS provider.
[1] Lockheed Martin hopes that the lunar activities will help develop precursor infrastructure and experience for a Mars expedition.
The lunar lander concept was presented in October 2018, and it envisions a single-stage, fully reusable lander system capable of taking off to return to the orbiting Lunar Gateway.
[2] The lander concept envisions the use of the pressure vessel of the Orion spacecraft, and some of Orion's existing systems such as life support, controls, and some avionics, so Lockheed Martin officials think that construction time would be relatively short.