A digital portfolio is...

Digital portfolio, sometimes referred to as multimedia portfolios, electronic portfolios, e-folios and web folios contain much of the content traditional portfolios include but present these materials in digital format.

http://digitalportfolio.wikispaces.com/What+is+a+digital+portfolio%3F

Two important features of a digital portfolio...

1) Materials, also called artefacts, are presented using a combination of multimedia technologies such as audio recordings, database, spreadsheet, video and others.
2) Digital portfolios are a way of showcasing student achievement through class assignments, community service, and occupational experience

http://digitalportfolio.wikispaces.com/What+is+a+digital+portfolio%3F

Two advantages of a digital portfolio...

1) Community: Sharing ideas and resources.
2) Technology: Digital portfolios are one of the best ways for students to communicate their knowledge and expertise related to their use of technology.


http://electronicportfolios.com/portfolios/encyclopediaentry.htm

Two disadvantages of a digital portfolio...

1)The creation of digital portfolios requires advanced knowledge and skills and sometimes expensive, high-tech equipment.
2) Viewing a digital portfolio sometimes requires special software as well as additional knowledge and skills on the part of the viewer.


http://electronicportfolios.com/portfolios/encyclopediaentry.htm