# Using blocks

A block is a set of electronic parts designed to perform a specific task within an electronic circuit. This lets you build complicated systems rapidly, using a top-down approach.

If blocks are available in the software, you will find a selection of pre-written blocks in the Electronics folder in the Parts library They are divided into Inputs, Process Blocks, and Outputs. You can build up many complex systems by connecting input blocks to output blocks using one or more processes.

Click on a block (default action) to open its pop-up and see its contents. You cannot edit these contents by default. To enable editing, select Advanced... from the block's menu and un-check the Lock pop-up contents box.

Tips for use:

- Note that blocks cannot be used when creating a printed circuit board using real-PCB.

## See also:

- Standard block
- Custom block
- Using electronics parts