A retailer's use of a mark solely to identify its retail business, and not on or in any physical or other relation to the goods it sells, constitutes use of a service mark and not use in relation to goods within the meaning of section 2(3)(a) of the Trade Marks Act 194 of 1993. Where a registered trade mark is a composite of common words in everyday use, the proprietor cannot secure a monopoly in one of those component words. For marks to be confusingly similar under section 34(1)(a), the additional elements of composite marks cannot be disregarded; both visual, aural and conceptual aspects must be considered in the global appreciation of the marks. Evidence of actual confusion must be substantial and properly explained; isolated instances over an extended period, many explicable by error or haste, do not establish likelihood of confusion. The nature of online retail transactions, with built-in safeguards and multi-step purchasing processes, is a relevant consideration in assessing likelihood of confusion. For the anti-dilution provision in section 34(1)(c) to apply, similarity between marks requires more than a common word; unfair advantage or detriment must be properly substantiated on a balance of probabilities, not merely asserted.