A term of both respect and devotion means Divine Master. On a practical level, name what it teaches, the knowledge of your inherent Divinity. On the mystical level, Guru means spiritual master and Devi means goddess. Thus, the title names the person who knows their own Being, as yoga promises.
A yoga teacher is someone who teaches yoga. They can be called yoga instructors or simply teachers. The title “instructor” is usually given to someone who is qualified to teach yoga and who has done so for a certain amount of time. A yoga instructor is someone who teaches yoga classes based on their understanding of yoga poses and the philosophies on which they are based.
They then share that knowledge with the students. Most of the time you'll read yoga teacher training courses and how to become a yoga teacher, while you'll often see yoga instructors as well. A good yoga instructor must show authenticity in personality, have a real passion and energy for teaching, along with a positive attitude. A yoga instructor is someone who tells someone what yoga poses should be done, officially or formally.
As the practice of yoga caught on and became a global phenomenon, many of the basic principles of yoga were lost. For someone to become a yogi, along with pranayama and asana, other guidelines must be incorporated, such as karma yoga, bhakti yoga, yogic philosophy, tapas, mantra, mudra and meditation into their lifestyle. In modern yoga, a yoga instructor usually teaches group yoga classes in a yoga studio, gym, or gym. Other types of yoga affect other aspects, such as mental concentration (Raja Yoga), improve emotional states (Bhakti Yoga) and extract toxins, control weight and increase movement (Bikram Yoga).
Yoga instructors, yoga teachers, and yoga therapists are all similar in that they teach others how to practice yoga. Unlike traditional yoga classes that have a lot of students, yoga therapy is generally taught individually or only in small groups. It is a very prestigious designation and is only earned after having excelled in the field of yoga. That's why a yoga instructor is designed to help others along the path of yoga, including pranayama practices, meditation and, of course, yoga asanas.
In any case, your yoga instructor will most likely not be angry or upset, especially since this is probably your first time with him. This is most common in branded yoga styles, such as yoga nidra, vinyasa yoga, yin yoga, chair yoga, hot yoga, etc. However, a yoga instructor knows each pose and will explain to students the benefits of a pose and explain the muscle used when doing the pose.