Explanation: These are the grades of toilet paper.

It seems like you're asking for an explanation related to the grades or qualities of toilet paper. Toilet paper is typically categorized into different grades based on factors such as softness, strength, absorbency, and ply (layers of paper). Here's a breakdown:

1. 1-Ply Toilet Paper: This is a single layer of paper and is usually less absorbent and less durable. It's often seen as more economical but may not provide as much comfort or effectiveness compared to thicker options.

2. 2-Ply Toilet Paper: This is the most common grade of toilet paper. It has two layers, which makes it thicker, more absorbent, and stronger than 1-ply. It offers a better balance of comfort and effectiveness.

3. 3-Ply Toilet Paper: This version has three layers, making it even softer, stronger, and more absorbent than 2-ply options. It's often marketed as a premium product, offering greater comfort.

4. Ultra-Soft/Deluxe Toilet Paper: These are premium options designed for superior comfort. They are often thicker (sometimes 3-ply or more) and made with materials that feel softer on the skin. Some may even have added fragrances.

5. Recycled Toilet Paper: Made from recycled paper, this is an eco-friendly option that can range in ply and softness. While it may not be as soft as virgin fiber toilet paper, it's a sustainable choice.

The "grade" of toilet paper generally refers to these distinctions, and consumers often choose based on their personal preference for softness, strength, and environmental concerns.