What is Bhagavad-Gita.?

Although published and read  by itself, Bhagavad-Gita originally appears as an episode in Mahabharata. Bhagavad-Gita is the dialogue between God Krishna and his devotee friend Arjuna just before the onset of war, a great fratricidal conflict between the hundred sons of Dhritarastra and on the opposing side their cousins the Pandavas, or sons of Pandu . The Gita has long been considered the essence of Vedic literature, the vast body of ancient scriptural writings that forms the basis of Vedic philosophy and spirituality. As the essence of the 108 Upanisads, it is sometimes referred to as Gitopanisad. Krishna speaks for the benefit of all souls who have forgotten their eternal nature, the ultimate goal of existence, and their eternal relationship with Him. Bhagavad-Gita has the answers to every questions of our life. It is just not the ancient book rather it is the manual for our life who have forgot our true self , our duties and ultimate goal. Also, there are the measures to avoid the miseries of life such as birth , death, old age and diseases permanently and establish oneself in the ocean of everlasting eternity , knowledge and happiness.
There are many questions which our modern science and philosophy can not  answer at all. We can find answers to even those mysterious question in very simple ways.  Thus , Bhagavad-Gita is a must read book for everyone.