The Vietnamese word "bản sao" is a noun that means "copy" or "duplicate." It refers to a reproduction of an original document or item.
You can use "bản sao" when you want to talk about a version of something that is not the original. It can be used in various contexts, such as legal documents, photographs, or any material where having a copy is necessary.
In more formal or legal contexts, "bản sao" can refer to official copies of documents, such as birth certificates, contracts, or licenses. For example, you might say, "Tôi cần một bản sao chứng minh thư để làm thủ tục." which means "I need a copy of my ID to complete the procedures."
While "bản sao" primarily means a copy, it can also imply a version of something that is not the original but serves a similar purpose. For instance, in digital contexts, "bản sao" can refer to digital copies of files.