Introduction
Prior to explaining about Web Applications, I am just sharing few ideas about the hierarchy of SharePoint. There are four levels in SharePoint.

You can create multiple Web Applications under a Farm in SharePoint. Farm is the main parent of SharePoint. Web Application is the child of Farm in SharePoint. Site collection is a child of Web Application in SharePoint. Web is the grand child of site collection in SharePoint.
Prior to explaining about Web Applications, I am just sharing few ideas about the hierarchy of SharePoint. There are four levels in SharePoint.
You can create multiple Web Applications under a Farm in SharePoint. Farm is the main parent of SharePoint. Web Application is the child of Farm in SharePoint. Site collection is a child of Web Application in SharePoint. Web is the grand child of site collection in SharePoint.
What is Web Application?
Web Application refers to the parents of site collection in SharePoint. We can create a multiple number of site collections under a Web Application.
During creation of Web Application, we have to take care about a few things, which are given below.
- Create an IIS Website
- Port No
- Host Header
- Path of the Web Application
- Authentication type
- Database name
Example
A company has multiple branches in different countries and different states. Thus we have to create an application in SharePoint .
Let's assume my company name is RajInfotech and it's located in USA, Canada, India and Dubai.
Here, I have to create a Web Application for RajInoftech. Rajinfotech refers to the parents and we have to create all the branches under Rajinfotech.
URL- http:// Rajinfotech.com (Web Application Name)
URL- http:// Rajinfotech.com (Web Application Name)
We should create all the branches under Rajinfotech Web Application .
URL : http:// Rajinfotech.com/Sites/USA (USA :Site Collection)
URL : http:// Rajinfotech.com/Sites/CANADA (CANADA: Site Collection)
URL : http:// Rajinfotech.com/Sites/INDIA (INDIA: Site Collection)
In a country, If we have multiple braches, then we have to create Sub sites under a site collection, as shown below.
URL : http:// Rajinfotech.com/Sites/INDIA/Bangalore (Bangalore : Sub Sites)
Steps to create a Web Application
Step 1
Click Start Button in your computer -> Search SharePoint Central Administrator.
Step 2
Click SharePoint Central Administrator -> go to Application Management -> Click Manage Web Application.
Click Start Button in your computer -> Search SharePoint Central Administrator.
Step 2
Click SharePoint Central Administrator -> go to Application Management -> Click Manage Web Application.
Step 3
Once you click Manage Web Application, a pop-up Window will open to create a new Web Application.
Already two Web Applications are shown here because these are the default Web Applications created during SharePoint installation.

Dharmraj ThakurPosted May 19, 2017, 1:09 AM
Nice one............