Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.
Q: I have to write this on a website, which one is better? Are you looking for [...](description of our service)? You've come / You came to the right place!.
A: 
When you mention something that happened in the past, its timing isn't mentioned and is perhaps no significance to your mention, and you're mentioning it because of its significance in relation to something happening in the present then the present perfect is suitable. In this case, 'You came to the right place' isn't grammatically incorrect, but it doesn't express as explicitly what 'You've come to the right place' does: That, because of your having come here, you are now, in the present, in the right place (to receive good service, to eat a delicious meal, etc.). This use of the present perfect is summarized here.