42 Providing a software development kit (SDK) for development and customization of mobile applications; providing a software development kit (SDK) for development and customization of advertisements in mobile applications; design, development and distribution of computer software, software interfaces, integrable software components and mobile applications; design, development and distribution of computer software, software interfaces, integrable software components and mobile applications for integrating and implementing software components and files in mobile applications; design, development and distribution of computer software, integrable software components and mobile applications for facilitating engagement by users of mobile applications; design, development and distribution of computer software, software interfaces, integrable software components and mobile applications for distribution of downloadable computer software and mobile applications; design, development and distribution of computer software, software interfaces, integrable software components and mobile applications for the distribution, placement and customization of advertisements; design, development and distribution of computer software, software interfaces, integrable software components and mobile applications for creation, facilitation, and distribution of advertisements in software and mobile applications; design and development of online software interfaces for monitoring, management and facilitating of monetization and advertisements in mobile applications