Understanding the difference between symphony and orchestra is simple. Every symphony is an orchestra, but not every orchestra is a symphony.
A symphony is a large-scale musical composition, usually with three or four movements, while on the other hand, an orchestra is a group of musicians with a variety of instruments. There are mainly two basics orchestra, which is a chamber orchestra that employs over 50 or fewer musicians and symphony orchestras employ more than 100 plays how are mainly divided into percussion, brass, woodwind, and strings.
Another difference is that the concert orchestra is a preparatory group that builds a musical foundation through a classical piece for younger musicians and symphony is a more advanced group that focuses on creating original classical repertoire.