<b:if cond='data:blog.pageType != "static_page"'>
..... The contents of the content to be wrapped conditional tags (Content will be hidden in the static pages) .....
</b:if>

<b:if cond='data:blog.url == data:blog.homepageUrl'>
..... The contents of the content to be wrapped in the conditional tag (content will only appear on the home page) .....
</b:if>

for more details please refer to some function conditional tag for widget below: 

1. Widget displays only on the home page:

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.url == data:blog.homepageUrl'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

2. View the Widgets only on the post page:

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.pageType == "item"'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

3. View the Widgets only on certain page:

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.url == "Your URL"'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

Change "Your URL" to your page url.

4. Hiding the Widgets only on certain page:

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.url != "Your URL"'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

Change "Your URL" to your page url.

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.pageType == "static_page"'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.pageType != "static_page"'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'>
<b:includable id='main'>
<b:if cond='data:blog.pageType == "archive"'>
<!-- only display title if it's non-empty -->
<b:if cond='data:title != ""'>
<h2 class='title'><data:title/></h2>
</b:if>
<div class='widget-content'>
<data:content/>
</div>
<b:include name='quickedit'/>
</b:if>
</b:includable>
</b:widget>

Once you add a tag conditional upon, save the template and see the results. Not limited to the widget, with conditional tags you can wrap other elements such as scripts, CSS, or HTML template for reasons accelerate blog by reducing the script contained in a page or other privacy reasons. May be useful.