Send Texture is one of the a layer template that you can use to send a texture through one of texture sender devices in the Devices window. One possible use is to stream a texture through NDI.
Send texture
Device: select the device you'd would like to stream the texture through. An example is NDI or Spout.
Texture: the texture you want to stream.
1. Inserting the layer
Through the right click menu
Right click in the Timeline, select Generative category and choose Send texture layer
With the shortcut
Hold E and click in the timeline with the left mouse button
2. Creating Layer Connection
Holding Alt and dragging from one layer to another
You can create a Texture Layer Connection by holding Alt and dragging from the source layer to the destination layer. This will find the first texture variable in the source layer and set it as the source of the first texture variable it finds in the destination layer.
Dragging Texture variable
If you drag a texture variable of a source layer onto the destination layer (Send Texture layer), a Layer Connection is going to get created.
Using Layer Connection Window
You can also create a layer connection manually in the Layer Connection window.