The purpose of this study is to investigate in what way different types of online and learners’ dictionaries can help students’ and teachers’ work in foreign language learning and teaching. It would like to find out what some students at different ages and levels of proficiency and some teachers think about the role of dictionaries in the classroom and their work. It will contain a survey based on a questionnaire filled in by different groups of students and an interview with some teachers about how they can use dictionaries in the classroom and while preparing for their lessons.