It's used to describe the responsibilities, tasks, and duties that are inherent to a particular job.
Example:
* "The job of a software engineer entails writing code, debugging programs, and collaborating with other developers."
Here, "entails" tells us that these are essential elements of the software engineer's role.
Other ways to say "job entails":
* Requires
* Includes
* Involves
* Comprises
* Implies
In essence, "job entails" helps us understand the specific aspects of a job that are essential for its successful performance.