Explain the key difference between them

Sure, I can explain the key difference between them.

Step 1: Identify the two entities being compared. In this case, we need to determine which two things are being referred to as "them."

Step 2: Analyze the characteristics or attributes of each entity. Look for any distinct features or qualities that set them apart from each other.

Step 3: Compare the identified characteristics. Determine how the attributes of each entity differ from one another.

Step 4: Highlight the key difference. Identify the most significant or prominent difference between the two entities.

Step 5: Summarize the key difference in a clear and concise manner. Use language that is easy to understand and accurately conveys the distinction between them.