Wire splicing and soldering is a core concept that electricians and technicians will be plenty familiar with; describing the core concept of fusing and connecting 2 different cables together.
As experts in the dash cam field, we at BlackboxMyCar recognize that sometimes, setups aren’t always a perfect fit for certain vehicle models, and that certain pieces of equipment will need to be altered to work properly together. This is why we splice our own cables in-house, mainly focusing on extending hardwire kits, and splicing battery output cables.
The advice here will be generalized and somewhat applicable outside of the dash-cam field, but will primarily be focused on dash cam wiring, which is our niche of expertise. For splicing advice in other fields, consulting a local electrician is advised.