Managed service that provides full-text search capabilities, allowing applications to quickly find and retrieve relevant information from large datasets.
Search Service powers the search bar on e-commerce websites, helping customers instantly find products by typing keywords like 'blue running shoes'.
All four are managed search services that index data and provide fast full-text queries. AWS and OCI commonly use OpenSearch under the hood (Elasticsearch-compatible APIs). Azure AI Search is a dedicated search-as-a-service with strong built-in enrichment and relevance tooling. Google Vertex AI Search focuses on enterprise/website/app search with Google-quality relevance and optional generative/semantic capabilities.