What is the green thing call inside of electronics?

You're likely referring to the greenish-blue, slightly bumpy paste often found on electronic circuit boards. This is called solder paste, and it plays a crucial role in the manufacturing process. Here's a breakdown:

* Composition: Solder paste is a mixture of:

* Solder powder: Typically a tin-lead or lead-free alloy, which melts and forms the electrical connection.

* Flux: A chemical that helps clean the surfaces being joined and prevents oxidation, ensuring a strong bond.

* Solvent: A carrier liquid that allows the paste to be applied and dispensed easily.

* Function: Solder paste is used to connect electronic components to the circuit board. It's applied to the pads on the board and the component leads, and then heated (typically with a hot air reflow oven). The heat melts the solder, creating a strong and conductive bond.

* Color: While often green, the color can vary depending on the composition. It can also appear blue, grey, or even black.

Let me know if you'd like to know more about solder paste or the electronics manufacturing process!