The technique of inducing rain from clouds is called cloud seeding. Cloud seeding involves introducing certain substances, such as silver iodide or dry ice, into the clouds to stimulate the formation of raindrops or snowflakes. These substances act as nuclei for cloud condensation or ice crystal formation, enhancing the chances of precipitation.

Option 1, cloud computing, refers to the use of remote servers to store and manage data, perform computations, and provide services over the internet. It is not related to the process of inducing rain.

Option 2, cloud control, is not a commonly used term in the context of inducing rain from clouds. It does not accurately describe the technique.

Option 3, cloud engineering, is a broader term that encompasses various activities related to manipulating or influencing clouds for specific purposes, including rain enhancement. However, the specific technique of inducing rain is more commonly referred to as cloud seeding.

Therefore, the correct answer is option 4, cloud seeding.