See, for example:
- How to read binary file in Julia? - Stack Overflow
- How do I read a binary file back into an Array?
- Read binary data of arbitrary dims and type
All of these appeared in the first page of Google results for “read binary file Julia”, and they all point to the same function: read!.
(Of course, this assumes that your “binary data” just consists of raw arrays written directly to a file, as opposed to a more structured binary format like HDF5.jl.)