Digital portfolios can serve as evidence that students have met educational standards and requirements. They allow formative and summative assessment of student work and knowledge over time. When deciding content, teachers should select student work that best illustrates their knowledge and is aligned to the curriculum standards. Portfolios have progressed from paper to digital formats on the web, allowing greater access. Web-based options like Pageflakes, Netvibes, and Weebly offer students templates to create portfolios without HTML coding, and services like Box.net and Slideshare allow sharing of files.