You will be given a definition of a task first, then some input of the task.
In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

A siddur ( Hebrew : סדור -RSB- ; plural siddurim , -RSB- ) is a Jewish prayer book , containing a set order of daily prayers .
Output:
A siddur is a Jewish prayer book .