Introduction: "The book consists of 3 volumes introducing the basic information about the country and people of Laos and its people, about the basic characteristics of Laos through the fields of history - military, politics - economy and culture - society, compared with the characteristics of the country and people of Vietnam. Besides, the book also analyzes the past, current and prospects of connectivity in all areas of Vietnam-Laos relations. This will help to effectively implement the plan of cooperation between the two countries in the future, and also to realize Vietnam's foreign policy towards Laos." This book contains the following main contents: 1. Similarities in the founding fables of Vietnam and Laos. 2. Similarities in Vietnamese folk culture - Laos, the basis of forming solidarity. 3. Building and defending the homeland - similarities in the history of Vietnam - Laos. 4. Resistance against French colonialism and US imperialism, Vietnam and Laos along the same front.