What is meant by lubriication ? Why is it important ?

Explanation

### Step-by-Step Solution:

1. **Definition of Lubrication**:
- Lubrication refers to the process of applying a substance (usually a liquid, like oil) to surfaces in contact to reduce friction between them. This is done to ensure smoother movement of parts.

2. **Purpose of Lubrication**:
- The main purpose of lubrication is to decrease friction. When friction is reduced, it allows moving parts to slide over each other more easily, which is crucial in machines and engines where parts need to move in harmony.

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