# Update / convert values

> For the complete documentation index, see [llms.txt](https://kotlin.github.io/dataframe/llms.txt).

Both [update](update.html) and [convert](convert.html) can be used to change column values in a [DataFrame](dataframe.html).

Difference between these operations:

* [convert](convert.html) allows changing the type of the column, [update](update.html) doesn't

* [parse](parse.html) is a special case of [convert](convert.html) to convert String into different types automatically based on its contents

* [unfold](unfold.html) is a special case of [convert](convert.html) that turns columns of objects into [ColumnGroup](datacolumn.html#columngroup)s, with a column for every public property of these objects.

* [update](update.html) allows filtering cells to be updated, [convert](convert.html) doesn't

* [fill](fill.html) is a special case of [update](update.html) to replace missing values