Portfolios are purposeful collections of student work that exhibit their progress and achievement. They include student participation in selecting contents and self-reflection. Using portfolios for assessment matches real teaching and learning, has clear goals, and gives a profile of learner abilities and growth over time. It assesses a variety of skills and develops independent, active learners. Effective portfolios contain essential elements like a cover letter, table of contents, entries with dates and reflections, and criteria for assessing contents. Teachers guide students through the process, which involves identifying goals, introducing the concept, specifying content, and providing presentation guidelines. Students are supported through conferences and encouraged to engage in self-reflection and assessment.