Page Objct Model
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Page Object Model, also known as POM is a design pattern in Selenium that creates an object repository for storing all web elements. 
It is useful in reducing code duplication and improves test case maintenance.

Advantages of POM:
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1.Helps with easy maintenance
2.Helps with reusing code
3.Readability increases



Page Factory:
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Page Factory is a class provided by Selenium WebDriver to support Page Object Design patterns. 
In Page Factory,we use  annotation are
@FindBy
@FindAll-->When required WebElement objects need to match at least one of the given criteria use @FindAll annotation
@FindBys--/> When the required WebElement objects need to match all of the given criteria use @FindBys annotation
@CatchLookUp
 

Below are locators that can be used:
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id
ClassName
Css
Xpath
TagName
LinkText
PartialLinkText

initElements(): 
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initElements is a static method in Page Factory class.The initElements method is used to initialize web elements.
Using the initElements method, one can initialize all the web elements located by @FindBy annotation.