The document is an internship report submitted by Mariam Jahan Nipun to her professor regarding her internship at First Security Islami Bank Limited (FSIBL). The report contains an introduction, objectives of the study, methodology, limitations and various chapters on FSIBL's profile, history, Islamic banking principles, management structure, and different modes of investment including Bai, Mudarabaha, Musharaka and Ijarah. The report also includes annual reports of FSIBL from 2009-2012 and findings on FSIBL's investment trends, financial stability and SWOT analysis.