Although the use of technology in informal learning comes to the forefront with the internet and social media, mobile devices that provide access to information from anywhere, especially smartphones, are becoming more and more common with applications that enable individual learning. Mobile phones or smartphones, which are smaller in size and more convenient than tablet computers in terms of portability, are the most widely used mobile devices with their advanced technical features and widescreen dimensions. Providing users with access to mobile internet and other applications, regardless of location, creates a potential for instant and self-directed learning situations. Thus, users can use their knowledge to acquire a skill in daily life or work environments according to their learning needs and goals without any time and space constraints. In scientific researches, it has been observed that mobile phones facilitate the interaction of individuals in mobile environment and combine formal and informal learning experiences. As the importance of informal learning increases in individuals' lives, it can be thought that mobile phones can provide more effective learning by filling the gap between formal learning and informal learning. Studies have shown that besides the significant effect of web technologies on informal learning, mobile devices are devices that support informal learning in different environments and situations. On the other hand, nowadays, these technologies have been developed and their usage has become more widespread..

     These changing conditions make the use of mobile devices, especially smart phones, inevitable in adult education or professional development. In business or adult learning, where informal learning is so important, the use of common mobile technologies such as smart phones is becoming widespread. Individuals 'needs to learn on their own with smartphones in daily life or in work-related situations, such as how smartphones are used to meet these informal learning needs or with which mobile applications are attracted to researchers' attention.