The term "sealed" or "closed" refers to something that is securely fastened or protected from outside access. This can apply to containers, such as jars or boxes, which are tightly shut to keep their contents safe from contamination or spillage. In a broader context, it can also refer to documents or information that are not accessible to the public, often for privacy or security reasons. In various fields, such as law or science, a sealed environment is crucial for maintaining integrity. For example, a sealed laboratory ensures that experiments are conducted without external interference, while a sealed envelope protects sensitive information. Both uses emphasize the importance of security and confidentiality.