Online course providers offer massive open online courses (MOOCs) and structured classes that can be taken remotely. Students who enroll typically progress through a series of lessons and complete assessments to demonstrate their understanding of the material. Depending on the provider and the subject matter, some courses may come with certifications upon completion. While many online courses are free, others require a monthly subscription or a one-time fee for access to a broader range of advanced courses. Additionally, some providers may charge for certificates of completion or for enterprise-level access to their offerings. The range of subjects covered by online course providers is extensive, including coding, data science, marketing, graphic design, software skills, and career development. Some providers focus on niche skills with smaller course catalogs, while others boast extensive collections with hundreds of topics.