regularization, L1 and L2 norm

What is the main purpose of using regularization?

Regularization helps to choose preferred model complexity, so that model is better at predicting. Regularization is nothing but adding a penalty term to the objective function and control the model complexity using that penalty term. It can be used for many machine learning algorithms.

https://towardsdatascience.com/regularization-in-machine-learning-76441ddcf99a