From Steam website:
Network Campaign Co-Op and Mission Replay
Campaign Network Co-Op allows you and up to three friends to earn 14 new Achievements and take the fight to the Banished to experience the wonder of Zeta Halo, together across Xbox and PC.
With Mission Replay, you can relive your favorite moments, rediscover collectibles and explore the wonders of Zeta Halo on your own or with up to three other fireteam members!
Become the Master Chief:
When all hope is lost and humanity’s fate hangs in the balance, the Master Chief is ready to confront the most ruthless foe he’s ever faced. Step inside the armor of humanity’s greatest hero to experience an epic adventure and explore the massive scale of the Halo ring.
Explore Zeta Halo:
Halo Infinite offers the most expansive and adventure-filled Halo campaign to date set in the wide-open environment of the ancient ringworld, Zeta Halo. Explore the vast reaches of Installation 07, from stunning heights to mysterious depths below the ring. Rescue UNSC marines to gain reinforcements in your fight against a fearsome enemy known as “the Banished.”
Defeat the Banished
Set after the events of Halo 5 and shortly following a crushing defeat, the UNSC fleet lies shattered and stranded on the surface of the heavily damaged Installation 07. Amongst the wreckage, a terrifying clan of Brute warriors, The Banished, now roam the damaged ringworld. Outmanned and outgunned, Master Chief must stop the Banished from repairing the Halo ring and claiming control of the galaxy’s greatest threat.
PC Settings & Optimizations:
Halo Infinite is built for PC. From advanced graphics settings, ultrawide/super ultrawide support and triple-key binds to features like dynamic scaling and variable framerates, Halo Infinite is the best Halo experience on PC to date.
SYSTEM REQUIREMENTS
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows 10 RS5 x64
Processor: AMD Ryzen 5 1600 or Intel i5-4440
Memory: 8 GB RAM
Graphics: AMD RX 570 or Nvidia GTX 1050 Ti
DirectX: Version 12
Storage: 50 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: Windows 10 19H2 x64
Processor: AMD Ryzen 7 3700X or Intel i7-9700k
Memory: 16 GB RAM
Graphics: Radeon RX 5700 XT or Nvidia RTX 2070
DirectX: Version 12
Storage: 50 GB available space