Salesforce CRM provides two tools for data migration—the Import Wizard and the Apex Data Loader.
The Import Wizard

is designed for less-technical users and smaller, simple imports of up to 50,000 records. It takes you through the process step by step and displays error messages to alert you to potential record duplications (“dupes”). For more information, go to Help & Training | Importing Data | Using the Import Wizards.

Use the Apex Data Loader

for complex imports of any size. It’s for technical users only. You’ll need access to the API to use this tool, which is included with Enterprise and Unlimited Edition. If you have another edition, you can purchase the API separately by contacting your account executive. The Data Loader doesn’t display error messages to alert you to potential problems. However, this tool includes several features that help make large data imports easier, such as being able to save your mappings. For more information, go to Help & Training | Data Loader.

The table below summarizes the difference between the two tools. The instructions in the remaining steps refer to the Import Wizard.
https://www.salesforce.com/assets/images/campaigns/insights_data_migration_table.gif

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I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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