Waiting is having the automated task execution elapse a certain amount of time before continuing with the next step. It provides some slack between actions performed, in selenium slack between locating an element or any other operation with the element. The wait is mostly used to handle the ElementNotVisibleException exception during load of web page. Waits help a user to troubleshoot issues while re-directing to different web pages by refreshing the entire web page and re-loading the new web elements. At times there can be Ajax calls as well. Thus, a time lag can be seen while reloading the web pages and reflecting the web elements. https://www.ducatindia.com/javatraining/

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2. 
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Waiting is having the automated task execution elapse a certain
amount of time before continuing with the next step. It provides some
slack between actions performed, in selenium slack between locating
an element or any other operation with the element. The wait is mostly
used to handle the Element Not Visible Exception exception during
load of web page. Waits help a user to troubleshoot issues while re-
directing to different web pages by refreshing the entire web page and
re-loading the new web elements. At times there can be Ajax calls as
well. Thus, a time lag can be seen while reloading the web pages and
reflecting the web elements.

3. 
Selenium WebDriver provides the user with two types of waits in order to
handle the recurring page loads, web element loads, the appearance of
windows, pop ups and error messages and reflection of web elements on the
web page.
• Implicit wait: An implicit wait makes WebDriver poll the DOM for a
certain amount of time when trying to locate an element.
• Explicit wait. An explicit wait makes WebDriver wait for a certain
condition to occur before proceeding further with execution.
Implicit Wait
Implicit waits are used to provide a default waiting time between each
consecutive test step/command across the entire test script. Thus,
subsequent test step would only execute when the 30 seconds have elapsed
after executing the previous test step/command.

4. 
The implicit wait is a single line of a code and can be declared in the setup
method of the test script. However, Implicit wait time increases test script
execution time as each of the commands would be ceased to wait for a
stipulated amount of time before resuming the execution.
The Syntax of Implicit wait is:
The above line of code shall be included into test script soon after
instantiation of WebDriver instance variable. The first argument indicates the
time in the numeric digits that the system needs to wait. The second
argument indicates the time measurement scale in terms of SECONDS,
MINUTES, MILISECOND, MICROSECONDS, NANOSECONDS, DAYS,
HOURS.
For using implicit waits in the test scripts, it’s mandatory to import the
following package.

5. 
Explicit Wait
Explicit waits are used to halt the execution till the time a particular
condition is met or the maximum time has elapsed. Unlike Implicit waits,
Explicit waits are applied for a particular instance only. The explicit wait
is used to tell the Web Driver to wait for certain conditions (Expected
Conditions) or the maximum time exceeded before throwing an
“ElementNotVisibleException” exception.

6. 
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