I’ve always seen parallelism described as a special case of concurrency where the concurrent processing happens to run physically at the same time, while genera

I’ve always seen parallelism described as a special case of concurrency where the concurrent processing happens to run physically at the same time, while general case concurrency is about logically running at the same time (whether its actually at the same time or just appears that way). The use of the word concurrent here is consistent with that definition and the literature, where concurrent data structures are data structures designed to for safe concurrent access (whether they are accessed literally at the same time or not).