Android is an operating system based on Linux with a Java programming interface for mobile devices such as Smartphone (Touch Screen Devices who supports Android OS) as well for Tablets too.

To learn more about android visit Android Tutorial

Bootstrap is an open-source HTML, CSS, and JavaScript framework for building responsive and mobile-first applications on the web. To learn more about bootstrap visit Bootstrap Tutorial

LINQ means Language Integrated Query and it was introduced in .NET Framework 3.5 to query the data from different data sources such as collections, generics, XML Documents, ADO.NET Datasets, SQL, Web Service, etc. in C# and VB.NET. To learn more about LINQ visit LINQ Tutorial

Visual Basic (VB) is an object-oriented programming language and that enables the developers to build a variety of secure and robust applications that run on the .NET Framework.

To learn more about visual basic refer Visual Basic (VB.NET) Tutorial