What is the use of UPDATE statement in SQL? How is it different from ALTER statement?

UPDATE statement is used for modifying the existing records in a table. The UPDATE command specifies the rows to be changed using the WHERE clause and the new data using the SET keyword.
UPDATE <table name>
SET <fieldname> = <value or expression>
WHERE <criteria>

It modifies the existing data of a databaseIt modifies existing structure of database
It is DMLIt is DDL
It can only modify one or more records in a tableIt can add, delete or modify column of a table.
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