It is necessary to increase/decrease friction to prevent it from skidding.

Explanation

### Step-by-Step Solution:

1. **Understanding Skidding**: Skidding occurs when an object slides uncontrollably over a surface. This typically happens when there is insufficient friction between the surfaces in contact.

2. **Identifying the Cause**: The primary reason for skidding is a lack of sufficient friction force. When the frictional force is not enough to counteract the forces trying to move the object, skidding will occur.

3. **Preventing Skidding**: To prevent skidding, we need to ensure that there is enough frictional force acting between the surfaces. This means we need to **increase** the friction.

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