What Is a Neural Network? 5 Key Concepts for 2026
A neural network is a machine-learning model composed of layers of interconnected nodes (neurons) that learn to map inputs to outputs by adjusting numerical weights and biases during training. Each neuron computes a weighted sum of its inputs, adds a bias, and passes the result through a non-linear activation function. y = σ(Σ wᵢxᵢ + … Read more