A booklet is a small book that has a paper cover and that gives you information about something.
英汉词典释义
n.
小册子
The newly published booklet breaks down into three parts.这本新出版的小册子分成三部分。I picked up a free booklet on tooth care at the dentist's.我在牙医那里拿了一本关于牙齿保健的免费小册子。