A micro-credential is a qualification that certifies demonstrated mastery of a defined, narrow skill or competency rather than completion of a broad curriculum, and is typically earned in hours or days rather than weeks or months. The term is used across higher education, professional development, and corporate training to describe credentials that are smaller in scope than a traditional course certificate but more rigorous than a simple badge of participation. Micro-credentials are almost universally issued as digital artifacts — typically Open Badges or W3C Verifiable Credentials — so they are portable, shareable, and cryptographically verifiable by any employer or registry without contacting the issuing institution. Their value depends on three things: the credibility of the issuer, the rigor of the assessment behind the credential, and whether receiving employers or institutions recognise and value the specific competency named. A growing challenge is stackability: micro-credentials designed as modular building blocks can in principle be accumulated and recognised toward a larger qualification, but this requires the issuing institution to publish explicit stacking rules and for receiving institutions to agree on the mapping. From an implementation standpoint, issuing micro-credentials requires a badge platform or issuance API, a well-defined assessment rubric tied to learning outcomes, and a public badge page or credential page that verifiers can check. The practical risk is credential proliferation — issuing micro-credentials for trivially easy tasks devalues the format for everyone, so assessment rigor and outcome specificity are non-negotiable.