How do I know if I have ERC20 tokens?

How do I determine if I possess ERC20 tokens? Are there specific steps or tools I can utilize to verify their presence in my wallet? Is there a distinguishable characteristic or identifier that sets ERC20 tokens apart from other types of tokens or cryptocurrencies? I'm seeking clarity on the process to ascertain ownership of ERC20 tokens, ensuring that I have an accurate understanding of my digital assets.