# What is Gating Mechanism? Definition & Technical Mechanics

> **Source:** [SPIDITS AI AI Glossary](https://spidits.com/ai-glossary)  
> **Category:** Neural Architectures  
> **Canonical Citation:** [https://spidits.com/ai-glossary/gating-mechanism](https://spidits.com/ai-glossary/gating-mechanism)

## Definition
A Gating Mechanism is a structural design in neural networks that controls the flow of information through internal pathways using sigmoid-activated scalar multipliers.

## Architectural Mechanics & Deep Dive
A gating mechanism is a neural network component that controls the flow of information through a network using multiplicative gates (often using sigmoid functions). Gating mechanisms are crucial in recurrent networks like LSTMs and GRUs to control memory updates, and in Mixture of Experts (MoE) architectures to route tokens to the most relevant expert neural networks.

## Industry Applications & Real-World Use Cases
Long short-term memory RNNs, gating routes in mixture-of-experts, and SwiGLU activations.

## Frequently Asked Questions

### Give an example of a gate in an LSTM.
The Forget Gate, which outputs values between 0 (discard context) and 1 (keep context).

### How do gating mechanisms help in Mixture of Experts?
The Gating Router calculates routing coefficients to determine which subset of expert networks should process a token.

## Related Terminology
- [lstm](https://spidits.com/ai-glossary/lstm)
- [mixture-of-experts](https://spidits.com/ai-glossary/mixture-of-experts)
- [swiglu](https://spidits.com/ai-glossary/swiglu)

---
*From the SPIDITS AI Knowledge Base (336+ terms indexed). Explore full technical definitions: [https://spidits.com/ai-glossary](https://spidits.com/ai-glossary)*