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Web cookies (also called HTTP cookies, browser cookies, or simply cookies) are small pieces of data that websites store on your device (computer, phone, etc.) through your web browser. They are used to remember information about you and your interactions with the site.

Purpose of Cookies:

  1. Session Management:

    • Keeping you logged in

    • Remembering items in a shopping cart

    • Saving language or theme preferences

  2. Personalization:

    • Tailoring content or ads based on your previous activity

  3. Tracking & Analytics:

    • Monitoring browsing behavior for analytics or marketing purposes

Types of Cookies:

  1. Session Cookies:

    • Temporary; deleted when you close your browser

    • Used for things like keeping you logged in during a single session

  2. Persistent Cookies:

    • Stored on your device until they expire or are manually deleted

    • Used for remembering login credentials, settings, etc.

  3. First-Party Cookies:

    • Set by the website you're visiting directly

  4. Third-Party Cookies:

    • Set by other domains (usually advertisers) embedded in the website

    • Commonly used for tracking across multiple sites

Authentication cookies are a special type of web cookie used to identify and verify a user after they log in to a website or web application.

What They Do:

Once you log in to a site, the server creates an authentication cookie and sends it to your browser. This cookie:

  • Proves to the website that you're logged in

  • Prevents you from having to log in again on every page you visit

  • Can persist across sessions if you select "Remember me"

What's Inside an Authentication Cookie?

Typically, it contains:

  • A unique session ID (not your actual password)

  • Optional metadata (e.g., expiration time, security flags)

Analytics cookies are cookies used to collect data about how visitors interact with a website. Their primary purpose is to help website owners understand and improve user experience by analyzing things like:

  • How users navigate the site

  • Which pages are most/least visited

  • How long users stay on each page

  • What device, browser, or location the user is from

What They Track:

Some examples of data analytics cookies may collect:

  • Page views and time spent on pages

  • Click paths (how users move from page to page)

  • Bounce rate (users who leave without interacting)

  • User demographics (location, language, device)

  • Referring websites (how users arrived at the site)

Here’s how you can disable cookies in common browsers:

1. Google Chrome

  • Open Chrome and click the three vertical dots in the top-right corner.

  • Go to Settings > Privacy and security > Cookies and other site data.

  • Choose your preferred option:

    • Block all cookies (not recommended, can break most websites).

    • Block third-party cookies (can block ads and tracking cookies).

2. Mozilla Firefox

  • Open Firefox and click the three horizontal lines in the top-right corner.

  • Go to Settings > Privacy & Security.

  • Under the Enhanced Tracking Protection section, choose Strict to block most cookies or Custom to manually choose which cookies to block.

3. Safari

  • Open Safari and click Safari in the top-left corner of the screen.

  • Go to Preferences > Privacy.

  • Check Block all cookies to stop all cookies, or select options to block third-party cookies.

4. Microsoft Edge

  • Open Edge and click the three horizontal dots in the top-right corner.

  • Go to Settings > Privacy, search, and services > Cookies and site permissions.

  • Select your cookie settings from there, including blocking all cookies or blocking third-party cookies.

5. On Mobile (iOS/Android)

  • For Safari on iOS: Go to Settings > Safari > Privacy & Security > Block All Cookies.

  • For Chrome on Android: Open the app, tap the three dots, go to Settings > Privacy and security > Cookies.

Be Aware:

Disabling cookies can make your online experience more difficult. Some websites may not load properly, or you may be logged out frequently. Also, certain features may not work as expected.

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Jain's Advanced Functional Materials Group

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July 2013:

Posted on July 15, 2013September 17, 2015 by

Our work in the magazine: ‘Material World’, M. Jain, International Innovation, July 2013, (Research Media, UK, pp 102-104) ISSN 2051-8528

January 2014:

Posted on July 15, 2013September 23, 2014 by

Exchange student Rafael from the Federal University of Sao Carlos (Brazil) joined the group for 8 months. Welcome back Rafael!

June 2013:

Posted on June 17, 2013September 17, 2015 by

Margo’s papers got accepted in Journal of Physics: Condensed Matter. Congrats Margo!

Newer posts →

Recent news from our group

  • Ovijit joined the group. Welcome!
    MSE Graduate student Ovijit Das joined the JAFM group! Welcome Ovijit!    
    Posted on June 2, 2025
  • Nicholas Thiel-Hudson received University scholar and Honors medal and graduated
     Nicholas Thiel-Hudson finished his Honor’s thesis with me on magnetotransport properties in nanocomposite films and graduated from UConn with BS degree majoring in Physics and Music. Congratulations Nick!
    Posted on May 30, 2025
  • MRS Fall meeting (December 2024)
    Physics undergraduate student (University Scholar) Nicholas Thiel-Hudson, as well as graduate students Jacob Pfund and Zachary Ritchey presented their work at the MRS Fall 2024 meeting in Boston.
    Posted on December 5, 2024

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