Won't take long to answer: what exactly is a mode?

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A mode refers to a specific pattern of oscillation in a system, particularly in the context of waves and oscillations. A normal mode is characterized by all parts of the system oscillating sinusoidally at the same frequency while maintaining a fixed phase relationship. This concept is crucial for understanding the behavior of various physical systems, including musical instruments and mechanical structures. Many definitions found online can be vague, making it challenging to grasp the concept fully. Understanding normal modes is essential for analyzing wave phenomena and system dynamics.
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What exactly is a mode and what exactly is a normal mode when talking about waves and oscillations? I keep looking on the internet but I can't really find anything concrete. Some definitions are very obscure.
 
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