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**It is similar to vLOOKUP in Excel**
- Duplicate values in the 2nd parameter (“keys”) are not a problem.
- The 1st and 2nd paramters need to evaluate to the same number of values
**The 2nd and 3rd parameters need to evaluate to the same number of records**
- Formulas that use LOOKUP cannot be sorted
**LOOKUP looks into a long list of values (input); finds a match in a second list of values (keys), and, where there is a match, returns a corresponding value (values).**
- LOOKUP looks into data with duplicate values (input); deduplicates the input records (keys), and returns a summarized value based on the deduplicated data.