![maya lt 2019 merge vertex tool maya lt 2019 merge vertex tool](https://us.v-cdn.net/5021068/uploads/editor/jt/2xlgrlxkt85t.png)
It merges vertices at same position whatever operation was done to place those vertices at same location.
![maya lt 2019 merge vertex tool maya lt 2019 merge vertex tool](https://i.ytimg.com/vi/cyKej-7MZh8/maxresdefault.jpg)
If the exact spot where a vertex is moved contains more than one vertex, then the merge will be performed between the moved vertex and one of those This option affects interactive operations only (tweaks made in the Adjust Last Operation panel are considered interactive too).
![maya lt 2019 merge vertex tool maya lt 2019 merge vertex tool](https://i.ytimg.com/vi/LsDnWZ4hHTk/maxresdefault.jpg)