The other two options, Recent Blocks and Library Blocks, open the Blocks palette in the corresponding tab. In the context of AutoCAD, blocks are the set of geometries that act as a single object and can be used in a drawing on a repetitive basis. The blocks used in the drawing are called block references, and if the block is modified, all of its references change automatically. Creating blocks in AutoCAD is very easy.
First you must draw all the parts that will form your block. Remember to draw all the objects on layer “0”. When you are ready to create the block, select the Create button from the Block section of the Insert tab of the ribbon menu. Using blocks can help reduce file size.
AutoCAD stores block definitions in its database. When you insert a block, AutoCAD stores only the name of the block, its location (insertion point), scale, and rotation. This can be very noticeable in large drawings. Since you may have several graphics windows for a given Design tab and you may have several tabs, it's a mess that a block inserted in the Design also appears in model space.
Blocks are one of the most important types of objects in AutoCAD and are also used very frequently in almost all types of drawings. Remember to create the block, insert it: it's that simple (in most cases, you'll use the blocks in a template to save time). You can even easily add Internet hyperlinks to blocks so that you can connect a block to a provider's online catalog page. When inserting an external block, use the same INSERT command that you used earlier and use the Browse button to navigate to the folder where you saved the block.
You can also create your own tool palette and place your favorite CAD blocks on it, or you can create a complete catalog of your standard CAD blocks using tool palettes. Groups have a bit of a similarity to blocks and can also be used in places where you want to create an object from various geometries. Subsequent references to that block definition can be inserted at different locations, scales, and angles of rotation. Now select any object from the new block and you will see that all the objects are selected and the base point you have chosen is highlighted since it is (Insertion Point) from Osnap.
Now that the block is complete, you can select the closed block editor at the top of the drawing screen. This is why many organizations prefer their own set of standard blocks that can be used and reused according to their own requirements. Draw the following objects to create what you need for the computer block (seen from above of the keyboard and monitor) You don't need to size the computer. AutoCAD has a small library of some standard blocks that you can use in your drawings.
This block library can be accessed from the Design Center palette. Run the same Lock command that you used last time, only this time make sure that the Open in Block Editor box is checked.