English: Filled vias on a circuit board. Filled (or capped) vias don't have a visible hole after processing. This type of via is mainly used for via-in-pad for BGA fanout and is rarely visible like this. The outline of the covered hole is barely visible in this picture.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the
same or compatible license as the original.