What are the differences between pressure treated and ground contact wood, and how do these differences affect their performance in outdoor applications?

Pressure treated wood is treated with chemicals to resist decay and insects, while ground contact wood is specifically designed for direct contact with the ground. Ground contact wood is more durable and resistant to moisture, making it ideal for outdoor applications where the wood will be in direct contact with the ground. Pressure treated wood is suitable for above-ground applications but may not be as resistant to moisture and decay as ground contact wood.