Solder is the shiny silver-gray metal seen in tiny blobs on almost all circuit boards (see Figure 21-1). Soldering is the process of melting the solder onto the desired joints to connect the joint materials together both physically and electrically.
Figure 21-1. Circuit board featuring numerous solder points
At first, soldering may seem messy, complicated, or even dangerous. The perceived permanency may bother some beginners. But, after a little practice, it turns out that soldering is easy and effective!