What do you mean by coherent source?

Hint: In order to solve this problem, you need to know that two light beams are consistent when the phase difference between their waves is constant; they are non-coherent when there is a random or changing phase relationship.
Coherence, a fixed relationship between the wave phase in a single-frequency radiation pulse. Two light beams are consistent when the phase difference between their waves is constant; they are non-coherent when there is a spontaneous or shifting phase relationship.

Complete step by step answer:
Two sources are said to be coherent if they have a constant phase difference between them and have the same frequency. The difference in phase between coherent sources does not change with time. Laser light is an example of a coherent light source. The laser light emitted has the same frequency and phase. Sound waves are another example of a coherent source. The electrical signals from the sound waves travel at the same frequency and phase.

Note:
The concept of coherence is logical or coherent and makes sense in its entirety. An example of coherence is a statement that has no contradictions. The concept of coherence is either keeping together or simple to understand. The group of people who vote the same way is an indicator of coherence. An example of coherence is someone who talks simply and makes sense. Two sources are considered to be compatible if they have exactly the same frequency and zero or constant phase difference between them. Methods for generating them: division of the wave front where the wave front is split into two parts by reflection , refraction or diffraction.