What type of online service is primarily designed for storing files in the cloud?

The option for online storage is specifically tailored for the purpose of saving and managing files in the cloud. When users utilize an online storage service, they can upload files such as documents, images, and videos, allowing them to access these files from any internet-connected device. This accessibility enhances collaboration, as files can be easily shared with others and edited in real time, depending on the service features.

In contrast, web hosting services are designed to host websites and may not focus on file storage for individual users. Content management systems are primarily aimed at facilitating the creation, management, and publication of digital content, rather than being solely a storage solution. Domain registration services involve the process of securing a domain name for web presence and do not relate to file storage at all. Thus, online storage is the most relevant and appropriate answer for the service specifically meant for storing files in the cloud, emphasizing its dedicated purpose and functionality.