What are the differences between onshore and offshore software outsourcing?

Both of them are outsourcing services that deal with software development. The difference between them is that when you say "offshore", it means overseas. So if you avail of offshore software outsourcing, you are outsourcing software development to a different country. When you say onshore software outsourcing, it is still outsourcing but the company you outsourced the software development is within your country.