diff --git a/3 - Images and Text.ipynb b/3 - Images and Text.ipynb
index 483f04d0865dee84cfeda279e6e5dcd6293ca751..68c590e12e887e7adff1bd848fecd147b24a6cee 100644
--- a/3 - Images and Text.ipynb	
+++ b/3 - Images and Text.ipynb	
@@ -25,6 +25,65 @@
     "* Overview OCR formats"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "* What is IIIF?\n",
+    "    * International Image Interoperability Framework ([http://iiif.io/](http://iiif.io/))\n",
+    "    *  standardised method of describing and delivering images over the web\n",
+    "    * community that develops APIs and implements them in Software"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "fragment"
+    }
+   },
+   "source": [
+    "![iiif apis](./media/api_puzzle_pieces.png)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "* IIIF Image API\n",
+    "    * requesting and delivering images on the Web\n",
+    "    * [https://iiif.io/api/image/2.1/](https://iiif.io/api/image/2.1/)\n",
+    "    * Image Request URI Syntax\n",
+    "        * {scheme}://{server}{/prefix}/{identifier}/{region}/{size}/{rotation}/{quality}.{format}\n",
+    "        * [http://iiif.onb.ac.at/images/ABO/Z196807705/00000009/full/full/0/native.jpg](http://iiif.onb.ac.at/images/ABO/Z196807705/00000009/full/full/0/native.jpg)\n",
+    "        * 90 degree rotation: [http://iiif.onb.ac.at/images/ABO/Z196807705/00000009/full/full/90/native.jpg](http://iiif.onb.ac.at/images/ABO/Z196807705/00000009/full/full/90/native.jpg)\n",
+    "        * \"Articulus Quartus\": [https://iiif.onb.ac.at/images/ABO/Z196807705/00000009/pct:0,0,100,33/full/0/native.jpg](https://iiif.onb.ac.at/images/ABO/Z196807705/00000009/pct:0,0,100,33/full/0/native.jpg) \n",
+    "    "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "* IIIF Presentation API\n",
+    "    * returns JSON-LD structured documents that together describe the structure and layout of a digitized object or other collection of images and related content\n",
+    "    * [https://iiif.io/api/presentation/2.1/](https://iiif.io/api/presentation/2.1/)\n",
+    "    * [https://iiif.onb.ac.at/presentation/ABO/+Z196807705/manifest/](https://iiif.onb.ac.at/presentation/ABO/+Z196807705/manifest/)\n",
+    "    "
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {
@@ -63,7 +122,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.6.7"
   }
  },
  "nbformat": 4,
diff --git a/media/api_puzzle_pieces.png b/media/api_puzzle_pieces.png
new file mode 100644
index 0000000000000000000000000000000000000000..0ca27c5628a7dc2e886b92923e935e81bfcdf1d8
Binary files /dev/null and b/media/api_puzzle_pieces.png differ