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Patanjali's Yoga Sutra is divided into four chapters. The first known as "Samadhi Pada" outlines the basic context, outlines, processes and goals of Yoga. The entire Yoga Sutra is written in 195 sentences (Sutras) - a Sutra is no more than a sentence, literally a string of words. Brevity thy name is Patanjali.
The first three Sutras define Yoga teacher training India Yoga. Since, this article is entitled, "What is Yoga?" I will try to explain the first three Sutras as I have read, understood and experienced. They together define Yoga. There is no other definition that is universally accepted.
In Sanskrit the first Sutra reads, "Atha Yoganusasanam".