 Welcome back to the session on latex. In this session, we will learn to enhance our document using cross-referencing. Cross-referencing is nothing but referring to certain part within the same document. For example, while writing a paragraph or explaining some concept, you could mention a reference to another chapter, section, table, figure, etcetera. For example, in many papers or books, we get to read that, refer section 1.2 for information or the table 4.6 explains the movement of x, y, z, etcetera. There are two parts to it. The first one is creating a label with some key and the second part is referring with that key. These are some best practices that are used for defining the labels. For example, you write C H for chapter, S E C for section, F I G for figure, T B L for table and mention your key after that. Well, let us have a look at a demo. There are some sections, sub-sections already written over here. Starting with section 1 which is overview, then introduction, definition, audience, a table, specifications, requirement and functional. Well, now let us read out what is written in the overview. Section 2.1 covers some notations used in this article. Section 2.2 addresses, blah, blah, blah, blah, blah. Well, do not you think this is not a correct way of writing? What if we just add another section before introduction? Everything will mess up. To address this, we use the power of latex to add cross-referencing. The first task is to add labels, so let us add them. So, after every section or a caption, we write label. So, we come here and we write slash label. Since this is a section, we write S E C followed by the key that we want which is introduction. So, we just write intro. Similarly, for definitions, we write slash label. Since this is a sub-section, so we write S U B, S E C and we write say definition. For audience, slash label, S U B, S E C and we say audience. For a table, we write it just after the caption command slash label, TBL items, specification slash label, section specs, after requirement slash label, S U B, S E C and requirement. Finally, the last label, S U B, S E C function. So, now that I have added labels, let us refer to them. So, instead of section 2.1 which is the definition, let us write slash REF, S U B, S E C and definition. And section 2.2 which is audience, we write slash REF sub-section audience. So, rather than having the number 2.1 written here and number 2.2 written over here, we write slash REF sub-sec definition and REF sub-sec audience. The REF command displays the number of either the chapter, section, table, etcetera. Build and run, notice that appropriate numbers have appeared and they are highlighted in red border because of the hyperref package which we have. Also note that they are clickable. Now, let us read the next sentence. The section requirement on page number 3 points to what the users need. Here we would like the name as well as the page number of a particular reference. So, we write instead of requirements, we write slash name REF, S U B, S E C and requirements. And for the page number, we write slash page REF and the label is S U B, S E C requirements. Let us build and run. Notice that the name requirement and the page number 3 is displayed. There is one more sentence that needs cross-referencing, let us add it as well. So, instead of table number 1, we write slash REF, TBL items and for page number instead of 2, we write slash page REF and the key is TBL items. Build and run. There you go. So, we have table number 1 and on page number 2. You would do the same with figures and sub-figures as well. Now, just for some fun, let us insert another section with some random text. So, just before the introduction, we will add a section slash section, another section and let us add some paragraphs. We write 1 dash 4, let us build and run. Observe that the section numbers and page numbers have changed automatically. Where will you get so much of flexibility? This is the beauty of fletic. Let us go back to our slides. So, in this session, we learn to add labels and refer them. Thank you. Have a nice day.