It is used to check the compatibility of an application under different devices, it is used to verify UI Compatibility, Graphics Compatibility, and responsiveness. It is basically used to test UI.
for example, if we want to check web applications under different web browsers (Chrome, Firefox, Opera, Safari, IE)  and check UI then it is part of compatibility testing.
for example android app then we will check this application on different screen resolutions of different mobile devices, tablets, etc, and check UI.
Hardware support and configuration will be checked by compatibility testing,  we will check software to integrate with the printer, scanner, and other device system.
If we test any software application on cross-device, cross-platform, and cross-browser then it is called compatibility testing.
Component Testing:-
Using this we can divide the complete software into different modules and submodules and each module and submodule contain multiple components, if we check all components individually to test the application, we create separate test cases for a particular component in component testing.
for example in billing system software, we will check the complete billing details of customers then it is part of component testing.
In the login form, if we check the userid text field and password text field, individual and in combinations then it will be part of component testing.

Comparison Testing:-

Using this testing we will compare the actual application with the referral(reference) application to check each and every functionality.
for example if a client demand an e-commerce application similar to Flipkart then every time he will compare the all features of Flipkart to the development application.
We can compare applications based on design, graphics, performance, functionality, and other important factors.

Regression testing:-

this is the most important testing under the agile model, the testing team will cross-check the current bug of an application until it resolves. after solving the bug testing team will cross check the all previous builds or modules of an application to check that all modules of projects are working properly or not. we will check the complete application after solving every bug.
 it will take more time and effort to implement under manual testing, hence automation testing process is implemented especially for regression testing.
 Automation testing contains a test script for all scenarios hence we can easily execute the whole application within a few minutes.
It is mandatory for the incremental model and Agile model because these models releasing processes will be implemented step by step.
Load Testing:-
It is the part of non-functional testing that means load testing is used to measure the performance of an application where we will check the load time of an application under the maximum traffic limit.
Load testing never will be implemented manually, we will use many automation software tools to implement load testing. Apache Jmeter, load runner automation tools to use load testing operation.

Stress Testing:-

It is the part of load testing, where we will check the higher traffic load on the application then check the application response.
for example, if the application limit is 100 users then we can check with 90 to 100 and 100 to 110 then check the application response.
Security Testing:-
using this we can check the security of an application using login, logout, virus, illegal attack, risk factor option, URL, Data encryption, authentication, authorization, etc, we also cross-check applications using different networks and servers.
we will also check URL Patterns, URL security, and data security of web applications, especially for internal URLs.
Security Testing is the most important testing for the web applications, especially for a dashboard, accounting, payment transaction part.
SSL should exist on the SITE to provide data security because SSL provides a secure socket layer in an application.

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