Final answer:
Error LNK1120 is a linker error seen in software development that signals unresolved external dependencies due to missing function definitions or libraries needed for compilation.
Step-by-step explanation:
The error LNK1120 refers to a linker error that occurs in the context of software development with tools like Microsoft Visual Studio. This error indicates that the linker has failed to resolve one or more symbols in your code. Essentially, the error means that there were unresolved external dependencies when trying to compile the program.
For example, if you've written a function but have not provided a definition for it, or you are calling a library function without linking the appropriate library, this error could present itself. This error is typically accompanied by a number of LNK2001 or LNK2019 errors which detail the specific unresolved symbols.
To fix this error, you would need to ensure that all code dependencies are correctly defined and that all necessary libraries are linked. In other words, each function used in the code must have a corresponding implementation, and if it's from a library, that library must be included in the linker's search path.