1. Release: A release is the process of making a new version of software available for use by end-users or customers. It involves the preparation and distribution of the software package, typically including the application's code, documentation, and any necessary installation instructions. A release signifies that the software is now ready to be deployed and used by its intended audience.

2. Ship: Shipping, on the other hand, is the act of actually delivering the software to the end-users or customers. It involves the physical or digital transfer of the software package to the intended recipient, ensuring that it reaches them in a usable form. Shipping is a crucial step in the software development life cycle as it completes the process of delivering the software to its intended audience.

3. Timing: A key difference between a release and a ship lies in their timing. A release can occur before or after shipping the software. In some cases, a release may happen without immediate shipping, allowing for additional testing or quality assurance measures. Conversely, shipping can happen without a formal release if the software has already been made available to the users as a previous version.

4. Scope: The scope of a release and shipping can also differ. A release usually encompasses more than just the software itself but also includes associated artifacts such as release notes, documentation, and possible support materials. Shipping, however, mainly focuses on the physical or digital transfer of the software package, ensuring it reaches the end-users without necessarily including additional materials beyond what is necessary for usage.

5. Purpose: The purpose of a release is to make the software available to users officially, signaling that it has gone through a predefined set of quality checks, testing, and readiness criteria. It serves as a milestone, often accompanied by a version number, indicating a significant step in the software's lifecycle. On the other hand, shipping is primarily focused on the logistical aspect of delivering the software. It ensures that the software package, which has already undergone the release process, reaches its intended destination.

6. Visibility: Lastly, another difference lies in the visibility of a release and shipping. A release is more visible and generally involves communicating the changes, improvements, and new features included in the software to the intended audience. This communication may range from release notes, change logs, blog posts, or even marketing materials. Shipping, on the contrary, is usually less visible to the end-users as it mainly concentrates on the logistics of delivering the software package without necessarily broadcasting its arrival.

In summary, the key differences between a release and a ship lie in their timing, scope, purpose, and visibility. A release signifies the readiness of the software package, whereas shipping focuses on the delivery of the software to the intended audience.