How to solve the problem of selenium waiting until page loads?

I run nearly 30-40 test cases twice a day. And every time some test case fails due to page load time. In fact I have explicitly mentioned Thread.sleep("2000"); wherever I feel it takes more time to load. But still some 5-6 test cases fail. How can I make my selenium wait until the page loads ?? And I got this exception

Starting ChromeDriver 2.25.426923 (0390b88869384d6eb0d5d09729679f934aab9eed) on port 1828

              Only local connections are allowed.Exception in thread "main" org.openqa.selenium.ElementNotVisibleException: element not visible(Session info: chrome=54.0.2840.99)

              (Driver info: chromedriver=2.25.426923 (0390b88869384d6eb0d5d09729679f934aab9eed),platform=Windows NT 10.0.14393 x86_64) (WARNING: The server did not provide any stacktrace information)               Command duration or timeout: 36 milliseconds

              Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 16:57:40'System info: host: 'DESKTOP-LU4RI93', ip: '10.100.154.4', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_111'

              Driver info: org.openqa.selenium.chrome.ChromeDriver Capabilities [{applicationCacheEnabled=false, rotatable=false, mobileEmulationEnabled=false, networkConnectionEnabled=false, chrome={chromedriverVersion=2.25.426923 (0390b88869384d6eb0d5d09729679f934aab9eed), userDataDir=C:UsersHRT 1~1AppDataLocalTempscoped_dir6436_32242}, takesHeapSnapshot=true, pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true, hasTouchScreen=false, version=54.0.2840.99, platform=XP, browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true, locationContextEnabled=true, webStorageEnabled=true, browserName=chrome, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]

              Session ID: dacb1d58627c657aa111d94eba60b81f