What is heart murmur ? Name atleast two diseases which may result in heart murmur.

Explanation

**Step-by-Step Solution:**

1. **Definition of Heart Murmur:**
A heart murmur is an abnormal sound produced by the heart during the heartbeat cycle. It is typically caused by turbulent blood flow within the heart or through the heart valves.

2. **Causes of Heart Murmur:**
Heart murmurs can occur when there are defects or damage to the heart valves. These valves are responsible for ensuring that blood flows in the correct direction through the heart. When they are not functioning properly, it can lead to abnormal sounds, which are referred to as heart murmurs.

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