# concat

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

Combines rows from multiple [DataFrame](dataframe.html) objects and returns a single `DataFrame`.

API reference: [concat](https://kotlin.github.io/dataframe/api-docs/core/org.jetbrains.kotlinx.dataframe.api/concat.html)

```KOTLIN
df.concat(df1, df2)
```

```KOTLIN
df concat df1
```

```KOTLIN
df.concat(listOf(df1, df2))
```

```KOTLIN
listOf(df1, df2).concat()
```

See [all use cases of 'concat' operation](concat.html).