Quote stuffing is a type of market manipulation where a trader rapidly enters and cancels orders to flood the market with quotes, creating a false appearance of market activity or manipulating prices. This can include:

1. _High-frequency trading_: Using algorithms to rapidly enter and cancel orders.

2. _Layering_: Placing multiple orders at different price levels to create the appearance of market depth.

3. _Spoofing_: Placing orders with no intention of executing them to manipulate prices.

4. _Flashing_: Rapidly entering and canceling orders to create a false sense of market activity.

Quote stuffing can:

1. _Disrupt market integrity_: Creating false market signals and misleading other traders.

2. _Manipulate prices_: Influencing prices by creating a false sense of supply and demand.

3. _Overwhelm markets_: Flooding the market with quotes, leading to technical issues and delays.

Regulators and exchanges have implemented measures to prevent quote stuffing, including:

1. _Quote limits_: Limiting the number of quotes that can be entered in a given time period.

2. _Trade surveillance_: Monitoring trading activity for suspicious patterns.

3. _Market monitoring_: Analyzing market data for unusual activity.

4. _Penalties and fines_: Imposing penalties and fines for engaging in quote stuffing.

5. _Improved market infrastructure_: Upgrading trading systems and technology to prevent technical issues.