# Introduction to neural networks

3Blue1Brown by Grant Sanderson has a series of 4 videos on neural networks which is easy to watch, fun, and does an excellent job at explaining the functioning of a simple neural network. In this section, we will watch the first 2 videos as an introduction to what neural networks are and how they learn.

## What are NN? (19 min)

As you develop your own ML models, if you find that your mathematical background is shaky, 3blue1brown also has an excellent series of videos on linear algebra and an equally great one on calculus.

## How do NN learn? (21 min)

## NN vs biological neurons and types of NN

Slides (Click and wait: the presentation might take a few instants to load)