Dear Somenath Chakraborty, In machine learning, the dot product is the key tool for calculating vector projections, vector decompositions, and determining orthogonality.

]Dot product is more important.

Dear Dr Somenath Chakraborty . See the following useful RG link: Article Conceptual Understanding of Dot Product of Vectors in a Dyna...

Kindly see also the following very good RG link: Article Machine Learning Interpretability: A Survey on Methods and Metrics

Thank you Aref Wazwaz , Aparna Sathya Murthy , Rahul Sharma for their valuable answer.

Radosław Walkowiak be descriptive and elaborate with new finding, basic stuffs we all know, so it would be better if you talk about more intricate details. Thank you.

You are most welcome dear Somenath Chakraborty

Wish you the best always