What is Activation Function & Why you need it in Neural Networks

Hi guys are you working on neural networks or deep learning models and came across activation functions? And wondering what activation function is and why do we even need to use them in our deep learning models. In this post we are going to talk about activation function and why we should use activation functions in our neural networks. If you are planning to work in deep learning & build models for image, video or text recognition, You must have very good understanding of activation function and why they are required. I am going to cover this topic in a very non-mathematical and non-technical way so that you can relate to it and build an intuition.