Backpropagation Explained in 30 Seconds | Gradient Descent Explained (Part 2/3)

Added: 2026-05-16

[00:00:00]Descent [music] refers to moving downward on a surface or slope, and gradient is just another term for [music] slope in math.

[00:00:08]It's used for many different types of problems. For example, finding the [music] fastest shipping routes or minimizing costs in a large company.

[00:00:17]In machine learning, [music] the same idea is used to minimize another type of cost.

[00:00:22]How wrong a neural network's predictions [music] are based on a set of data.

[00:00:27]After minimizing this error, the neural net is set to have learned the data, >> [music] >> and then it can be used for new data it hasn't seen before.

[00:00:35]In this context, [music] you'll often hear the term backpropagation, which describes how the gradients or slopes are computed in a neural network.