What is the difference between isBLANK and isNULL in salesforce?

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I'm confused about isBLANK and an isNULL in salesforce. I think both are same, but they are not same. What is the difference between isBLANK and an isNULL?

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javanullsalesforce

1 Answers

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From the official documentation:

Use ISBLANK instead of ISNULL in new formulas. ISBLANK has the same functionality as ISNULL, but also supports text fields. Salesforce will continue to support ISNULL, so you do not need to change any existing formulas.