What is the passive cooling of CPU cooler?

Compared to standard air coolers, passive coolers are less common but theoretically similar. They rely on specially designed heat sinks to absorb and dissipate heat without the need for fans. For devices with low noise requirements, this type of radiator is very useful, but most gaming computers use air coolers or liquid coolers.
The efficiency of air coolers varies due to various factors, such as the materials used in construction (e.g. copper has better conductivity than aluminum, but aluminum is cheaper), and the size and number of fans connected to the CPU heat sink. This is why the size and design of CPU air coolers may vary.
Large air coolers usually have better heat dissipation, but there is not always enough space to accommodate larger heat dissipation solutions, especially in small computers.