The difference between SSL and IPSec

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First, here are some resources to help you learn more about each of these technologies: How SSL works
An introduction to IPSec encryption
Step-by-step guide to Internet Protocol Security

SSL is typcially chosen over IPSec only because SSL is more mature and easier to use for Internet transactions. IPSec will typically (note typically) require more manhours to configure and maintain, thus not a good choice for, say, Internet Web-type transactions. Simple rule of thumb: If always using the same connection to the same business partners, IPSec may be best. If attempting Internet-type transactions with many one-time clients use SSL.