Yes, special relativity is a special case of general relativity. General relativity reduces to special relativity in the special case of a flat spacetime. In other words, general relativity reduces to special relativity when gravity is negligible, for example in space far from any objects or when considering a small enough piece of space in freefall that gravity is unimportant to the problem.

Special relativity describes the relationship between an observer and constant speed while general relativity describes the relationship between an observer and acceleration. Special relativity applies to all physical phenomena in the absence of gravity while general relativity explains the law of gravitation and its relation to the forces of nature.

I hope this helps. Let me know if you have any other questions.
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