Which type of wall do you need?

Retaining?

If your wall will have dirt behind it, it is considered a retaining wall. Retaining Wall Blocks are designed with lips and setbacks to give them strength to stand up to the pressure of the dirt behind them. They are only textured on the front, which is the only surface to be seen.

Referred to as a Segmental Retaining Wall, or SRW for short.

Freestanding?

If there is no dirt behind your wall and it can be seen from both sides, then it is considered a freestanding wall. Freestanding Wall Blocks have texture on both sides and do not 'setback' or lean back. These walls are typically used for defining areas such as courtyards and patios.

Referred to as a Freestanding Wall, or FSW for short.