Hi Haruki! Seminar and tutorials are two kinds of meetings or gatherings in which a transfer of knowledge take place. A seminar is a conference or a meeting for discussion or training. A tutorial is an interactive and informal class which involves a tutor and a small group of students. However, the term seminar is sometimes used in certain contexts to refer to a tutorial. The key difference between seminar and tutorial is the number of participants. A tutorial involves a very small group of students where as seminar involves a larger number of participants who are interested in that particular subject.

A "tutorial" is just a set of detailed instructions that explain how to do something. The internet is full of tutorials. For example, a video that shows how to cook miso katsu is a tutorial. An article that explains the steps for fixing a phone is a tutorial. A "seminar" is like a presentation, or sometimes a group of presentations. A seminar can be at a conference that you go to "in person", or it can also be on the internet. Seminars are usually much longer than tutorials. Good luck!