diff --git a/src/domain/card.ts b/src/domain/card.ts
new file mode 100644
index 0000000..fc07206
--- /dev/null
+++ b/src/domain/card.ts
@@ -0,0 +1,16 @@
+export interface Card {
+  id: string
+  question: string
+  response: string
+  theme: string
+  tags: string[]
+  createdAt: Date
+  updatedAt: Date
+}
+
+export interface CardInput {
+  question: string
+  response: string
+  theme: string
+  tags?: string[]
+}
\ No newline at end of file