In lay man's terms:
1. MPLS - think of it a big expressway where you can send your data, video and voice traffic. Being a big expressway, more traffic can be sent but it is also expensive for an individual or a small business. So it is used more by big companies to connect their business to the Internet. There are also extra services provided because there are guarantees involved in using this service.

2. ADSL - uses the subscriber line you get when you apply for a phone line. This connects a home or a small office to the Internet while still providing a phone line service. Now think of bandwidth as a width of a road. "A" in the acronym stands for assymmetric because the upload bandwidth is normally less than the download bandwidth so you can download data faster than you can upload the same data. This was designed so because home users usually browse and download data from the Internet more than they upload data which is usually email.
Service Providers price the ADSL depending on the bandwidth you subscribe so higher bandwidth is more expensive. So if you use your Skype or Yahoo voice service a lot and you suffer from voice quality problems maybe you will need a higher bandwidth subscription or close other applications accessing the Internet while making your call.


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