Final answer:
A virus written in a specific language and placed within a document or spreadsheet is called a Macro virus. Macro viruses use macros to infect and spread to other files.
Step-by-step explanation:
A virus written in a specific language and placed within a document or spreadsheet is called a Macro virus. A Macro virus is a type of virus that uses the capabilities of macros, which are scripts or code snippets that automate tasks within documents or spreadsheets, to infect and spread to other files.
These viruses are typically written in programming languages such as Visual Basic for Applications (VBA) and are commonly found in software like Microsoft Office. For example, a Macro virus could be embedded in a Word document and, when the document is opened, the virus activates and infects the system, causing it to spread to other Word documents.