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Tanking is waterproofing the walls behind your tiles, this needs to be done in wet areas such as around baths and in showers. The reason you need to tank the walls is, if water gets behind the tiles through either a cracked grout line, incomplete or broken silicone or even though the grout which can happen in power showers this can damage the substrate if it isn't waterproof. If this happens this can lead to failure and tiles falling off.