A ribosome-binding site is a transcript region involved in recruiting or positioning a ribosome for initiation. In many bacteria it includes a Shine-Dalgarno sequence, but accessibility and start-codon context matter and not all bacterial initiation uses that motif.
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The ribosome-binding site (RBS) is a specific sequence in mRNA that is essential for the initiation of translation in prokaryotic organisms. It is typically located upstream of the start codon (AUG or other start codons) and plays a critical role in the proper positioning of the ribosome on the mRNA to ensure that protein synthesis begins correctly.