When something is termed 'obsolete', it is likely...

When something is described as 'obsolete', it signifies that it has become outdated or has outlived its usefulness, often because it has been replaced by newer or more effective alternatives. This term commonly applies to technologies, products, or practices that were once common but are no longer relevant due to advancements or changes in society. Recognizing something as obsolete indicates that it has been discarded or abandoned, either by choice or necessity, because it fails to meet current needs or standards. This is in direct contrast to the other options, which suggest characteristics such as relevance, innovation, or frequent use—qualities that would not apply to something considered obsolete.