Hey Pallavi, there are a few ways of switching control to a frame in Selenium Webdriver. Some of them are:
Using frame Id or Name: You can use frame's ID or Name to identify it and then use switchTo() method for switching.
Using frame Index: You can also use frame index as there are index values for each frame and to get the first frame you can use frame(0) and so on.
Using Xpath or CSS Selectors: Xpath and CSS Selectors can also be used to identify a frame.