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The reason for using a "for" loop to copy or move elements in std::vector and std::string is that these containers use contiguous memory to store their elements. This means that elements are stored one after the other in memory, allowing for efficient traversal and manipulation of the container's contents using a loop. Additionally, using a loop allows for fine-grained control over which elements are copied or moved, and in what order, which can be important for ensuring data integrity and maintaining performance.