How can the caching of the base docker image result in faster pulls?

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Caching of the base Docker image can result in faster pulls because when a Docker image is built, it consists of multiple layers of file systems. Each layer contains a set of files that can either be new or modified, or a copy of an existing layer. When a new image is built from an existing image, Docker only builds the layers that have changed, and reuses the existing layers. This means that if the base image is already cached on the local machine or on a remote system, Docker can simply pull the base image and reuse the layers that have not been modified, resulting in a faster pull time. This strategy reduces network usage, as well as build time, leading to faster deployments. Moreover, caching of the base image is particularly advantageous when multiple Docker images share a common base image, as it avoids duplicated layers that consume disk space and slow down builds.